Best Baby Bottle Warmers 2021

Whether you're thawing frozen breast milk or warming prepared baby formula or baby food, a bottle warmer is a huge time saver!

To find the best bottle warmers of the year, our hands-on reviews considered system reliability, safety, portability, versatility, and cost. For more details on how we evaluate baby bottle warmers, scroll down to the bottom of this article. Otherwise, here are the top 5 bottle warmers we found, followed by in-depth reviews of several additional options!

Dealing with breast milk or formula can be complicated and, frankly, sometimes annoying. You make that perfect bottle for your baby, and within 15 minutes it's no longer warm and your little one refuses to drink! You might be tempted to pop the bottle in the microwave, but the risk of overheating and having plastic chemicals leaching into the milk is too high. Also, a microwave can break down essential nutrients and overheat breast milk and formula, whereas a bottle warmer will evenly warm the baby bottle to the perfect temperature and help retain nutritional value.


Here are the Best Bottle Warmers of 2021!

1. Grownsy 5-in-1 Baby Bottle Warmer.

best baby bottle warmer grownsy

New to our list for 2021 and stealing the top spot, is this amazing 5-in-1 Grownsy bottle warmer! This new bottle warmer is simple, easy to use, reliable, efficient, and very reasonably priced (30 bucks). Even better, it fits wide Tommee Tippee, Comotomo, and AVENT bottles perfectly, as well as taller (9 ounce) Dr. Brown's bottles, all without any issues. It provides five core features: fast bottle warming, normal bottle warming, defrost, food heating, and sterilization. In our testing, we tried out all of the settings. Fast bottle warming works by rapidly warming refrigerated or room temperature milk in 2.5 to 7.5 minutes depending on how much milk is in the bottle and what the starting temperature is. A convenient table in the instruction manual provides an easy reference. You simply place the bottle into the chamber, add the indicated amount of tap or distilled water (40 mL), put on the lid, then press the FAST button and set the timer for the indicated duration. Once it starts, the timer will countdown and the system will beep three times to indicate the warming cycle has finished, before automatically turning off. This is the same exact process for the defrost mode. The normal bottle warming feature was also easy to use, and can provide constant bottle warming at your chosen temperature (typically 40°C or 104°F) for up to 24 hours. The same process works for food heating (just press the FOOD button), and sterilization (just press the STERILIZE button).

The sterilize function can do a full 15-20 minute steaming, which worked very well with bottles (put them in upside-down) and pacifiers. Every other function worked perfectly without any issues, and were impressed with how simple it was to use. After a month of daily use with tap water, the inside did develop mineral deposits and need to be descaled with vinegar; just like with any bottle warmer or sterilizer, we suggest using distilled water if your tap water has high mineral content (like ours!). We tested the primary function, fast bottle warming, with glass, plastic, and silicone baby bottles; all of them came out at a similar temperature, varying between 99° to 103° F. The only small con is that with taller and narrower bottles, such as a 9-ounce Dr. Brown's bottle, you will need to remove the nipple for the system's lid to close properly (which is necessary for fast warming). Not a huge deal, but worth mentioning. Overall, we love the Grownsy, and think it is an awesome new addition to our list - given the great features and reliability, and the amazing price, we think it's the obvious top pick! Interested? You can check out the Grownsy Bottle Warmer here.

2. Kiinde Kozii Safeheat Pro.

best bottle warmer kiinde kozii safeheat pro

Newly released for 2021, we were super excited to get our hands on this new baby bottle warmer for testing (thanks, Kiinde!). Like a few others on this list, the new Kozii SafeHeat Pro uses a warm bath to produce gradual and gentle convection heating, using lower temperatures than steam-based bottle warmers. The lower temperature helps preserve nutrients in breast milk (vitamins, minerals, amino acids, enzymes, and white blood cells) or baby formula, though it might add a minute or two to the warming cycle. Out of the box, the Kozii SafeHeat Pro feels like a high quality device - the plastics are good quality, the stainless steel interior lining is smooth and strong, and the lift-out basket and water filler are nicely designed. The lift-out basket allows you to place narrower baby bottles and smaller jars of baby food into the device, without worrying about reaching into the hot water to retrieve it. The water filler hangs on the back of the warmer and provides graduated markings to help you fill with the appropriate amount of water; distilled water is preferred, of course, however you can use regular tap water with regular (e.g., once a month) descaling. The beauty of a warm-bath style bottle warmer is that they have no hidden nooks and crannies and are very easy to clean.

Operation was very simple, there is one single knob on the front that allows you to set the number of minutes to warm its contents. The manual provides a very easy to understand guide regarding the type of item being warmed (milk, food), the starting temperature (refrigerated, room temperature), and material (glass, plastic, or breast milk storage bag); based on these factors, the manual gives you a recommended number of minutes to achieve an ideal temperature of about 104° F. Once the timer expires, the system automatically shuts off. We appreciated the wide-opening that could fit AVENT, Comotomo, Tommee Tippee, and other relatively wide baby bottles. It could also easily fit a Medela breast milk storage bag without issues. Taller bottles, like a 9-ounce Dr. Brown's bottle would stick up a bit over the top (the top of the milk was about a half inch over the water line), but this didn't lead to any warming issues. The only cons are relatively minor: there are no special settings for defrost, and the price is somewhat high given the features. Overall, we love the new Kiinde Kozii SafeHeat Pro and are excited to be the first major website to review it! Interested? You can check out the Kiinde Kozii SafeHeat Pro Bottle Warmer here.

3. Kiinde Kozii Original Baby Bottle Warmer.

best bottle warmer kiinde kozii

This (relatively expensive) bottle warmer is unique in comparison to the other ones on our list, as it uses a different filling and heating technique. For this system, you fill up a reservoir underneath the warming pot, and then when you turn it on, the water level rises up to surround the bottle. This is an interesting setup because it doesn't require filling a reservoir on the side and relying on tubes and other mechanisms to store and move the water, so there is less risk of things getting disgusting over the course of a few days. However, we wouldn't leave that water sitting down in the reservoir without using it for over 24 hours, as it's likely to get a little funky down there. To be fair, the water never comes in contact with the formula or breast milk, only the side of the bottle, so maybe we're just being paranoid.

In any event, this system uses a knob with multiple time settings ranging from 1 to 15. To figure out how many minutes you actually need to heat your bottle for, they include a handy little chart (which we copied below). Basically, you're looking at 5-8 minutes to warm a 4-8 ounce bottle, which is right on par with the other systems on this list. We made a big mistake when using this system, however, that we want you to avoid! We made the mistake of pulling a bottle out after a couple of minutes to check its temperature. What happens when you pull it out early is that the system thinks the water level is too low and starts to pump more water into the pot. Then, when you put the bottle back in, the entire systems over-flows onto the counter. That was annoying and a little dangerous given that it's really hot water. Overall, this is a pretty great bottle warmer, save for some minor issues. Who else recommends the Kiinde Kozii? Our friends at Babylist, Babygearlab, What2Expect, and The Bump all consider it a top pick! Interested? You can check out the Kiinde Kozii Bottle Warmer here.

kiinde kozii bottle warmer times settings instructions

4. Philips AVENT Baby Bottle Warmer, Fast.

best bottle warmer philips avent

This is a very similar concept to the First Years baby bottle warmer, but it does not include the cooler capability on the back. Like the First Years, it uses a little pot for warming up the bottle, rather than using steam, making it much easier to clean and maintain. In our tests, the pot worked really well for warming up bottles of formula or breast milk, and we never had any issues of the milk being too cool or hot after warming. To use the system, you place the baby bottle into the pot and then add enough water to fill ther reservoir up to the same level as the level of milk in the bottle. If the bottle is completely full, you can fill the reservoir up to about 1 cm below the top of the reservoir. It has different heat settings based on how much milk is in the bottle. To warm 4 ounces of refrigerated milk, we put it on the first setting and it took about 4 minutes to get it to the proper baby milk temperature (we checked it with one of our baby thermometers). To warm a larger 8 ounce bottle of milk, it took about 7 minutes on the high setting. When you turn it on, the light turns orange. But you need to pay attention to it, as the system has no auto-off function when it's done. Instead you need to read the chart in their owner's manual to figure out how long to warm the bottle. So this baby bottle warmer is pretty simple and basic, it has no timer or auto-off function, and only a couple settings for warming. But it's also cheap, coming in at around $35, so maybe that makes up for the lack of features. By the way, we found that this particular bottle warmer was able to fit our widest Tommee Tippee, Baby Brezza, and Comotomo baby bottles, which was awesome! Who else recommends the Philips AVENT Bottle Warmer? Our friends at Babylist, Babygearlab, WhatToExpect, and The Bump all consider it a top pick! Interested? You can check out the AVENT bottle warmer here.

5. First Years Night Cravings Bottle Warmer.

best baby bottle warmer first years

This is the best overall baby bottle warmer of the year, with some great features, high reliability, and a nice price point around $25. This system couples a bottle warmer on the front that heats and steams a little pot of water that you lower the bottle into, with a little cooler on the back that can fit 2 bottles. For the bottle warming aspect, we think this does the best job overall. Because it uses a little water pot rather than a complicated reservoir-based steaming system, it doesn't have the issue of slimy and gunky tubes and reservoirs to take care of. It heats up the water that surrounds the bottle. You use one of the little vials hanging on the side to add some tap water into the pot: you add water up to the lower or upper fill line depending on whether you're heating a bottle with 4 ounces or 8 ounces of milk. The vials are a nice touch because you can fill them before the night, then you won't be stumbling in the dark trying to fill to the proper line. Once you add the water and rest the bottle inside, just press the button on the front. The button has a light that will turn off when the bottle is ready. In our tests, when taking a plastic bottle of 4 ounces of mixed formula from our refrigerator and placing it in the warmer, when it was finished it came out at around 99.7 degrees Fahrenheit, which was pretty good. That temperature did vary a bit though, depending on whether we used glass bottles (those came out hotter), or thicker or thinner plastic bottles. So the bottle warming aspect worked like a champ, and we love the simplicity of the concept and not having to clean any steam reservoirs or tubes. We also loved how all of our bottles, both narrow and wide, fit nicely into this bottle warmer. We tested it with Comotomo, Tommee Tippee, and Dr. Brown's bottles. With this system, you also get an insert for warming baby food, which we never used, and a little cooler on the back. There is basically an ice pack that you can cool in your freezer then place in the cooler unit. Then you can put in 2 bottles and close it up, and maybe bring it with you on errands? We found the best use for this was at night: in the evening, place one or two bottles in the cooler with the frozen ice pack, and then when you get up in the middle of the night for a feeding they are ready to go right next to the warmer. A bit easier than having to open the refrigerator and find the bottle in the middle of the night. At first we didn't really see the added utility of the cooler on the back, but over time we got used to it and actually thought it was handy for night-time feeding. Overall, this is an excellent bottle warmer with the added feature of the cooler on the back, which you may or may not end up using. Interested? You can check out the First Years Night Cravings Bottle Warmer here.

6. Tommee Tippee Bottle and Food Warmer.

best bottle warmer tommee tippee

This bottle warmer uses an entirely difference concept than the other ones on our list, and it is specifically designed for travel. You don't need to plug it in, and it's highly portable, fitting nicely into a diaper bag or large purse without any issues. When we first received it, we thought it seemed really complicated, but then realized it's actually very simple. The system comes with three parts: a stainless steel thermos, a thermos cap, and a opaque plastic water reservoir. Here's how you use it: you fill the thermos with boiling water and close the lid. Then, you slide the plastic reservoir over the top of the thermos and screw it on. Pop it into your diaper bag or car, and go about your day's adventure. When you're ready to feed your baby, dump the thermos into the plastic reservoir to make a pot of hot water. Take your Tommee Tippee bottle (or your bottle brand of choice, it is wide enough for basically anything!) of breast milk or formula and stick it into the pot of hot water. Wait about 3-4 minutes and you will find that your bottle of milk is at a very nice temperature for feeding. We tried it out after a couple of hours, and then we tried it after about 11 hours of the water being in the thermos... it was still quite hot, and still worked like a charm. A couple downfalls: first, you need to bring the bottle of milk separately wherever you're going, probably in a cooler pouch, since it doesn't fit anywhere in the system until you're ready to warm it up. Second, it's bigger than we thought it would be, and doesn't fit in the car cup-holder (too wide). Third, the plastic reservoir that you put the hot water into when you're ready to warm the bottle gets very hot, so have a flat surface to put it on without needing to hold it. Overall, this is a great travel option with some small limitations. Cheap too, coming in usually around $15 or so. Who else recommends the Tommee Tippee bottle warmer? Our friends at Babylist, Babygearlab, WhatToExpect, and The Bump consider it a top pick! Interested? You can check out the Tommee Tippee bottle warmer here!

7. Dr. Brown's Baby Bottle Warmer.

best bottle warmer kiinde kozii

We only recently got our hands on this Dr. Brown's baby bottle warmer for testing, and we were excited to give it a try. It's one of the few baby bottle warmers on the market that can fit the tall Dr. Brown's glass baby bottles (see our list of best baby bottles here!). Using an adjustable bottom basket, it can fit both those really tall and narrow bottles, but also wide mouth bottles, and even jars of baby food. In our testing, however, it couldn't fit some of the really fat bottles, like the Tommee Tippee or Comotomo. With a design a little like a Keurig, the Dr. Brown's has a small refillable water reservoir on the side that holds enough water for about 5-6 bottle warmings. That's a nice touch, allowing you to fill it up once every few days rather than having to fill and empty every time you use it like some of the others that are lower down on this list. However, like we mentioned earlier, any bottle warmer with a reservoir system can be difficult to clean. In our testing, we found it to be super fast at warming bottles from the refrigerator or freezer. Out of the fridge, a 5-ounce bottle took about 3-4 minutes to warm up, and out of the freezer it took about 6-7 minutes. Another feature we liked is that it remembers the last setting you used - so if the last time you warmed for 4 minutes, it will default to that setting the next time you turn it on. So that's pretty convenient. But in our testing, we found that the warming was sometimes unreliable. In some cases we'd get a bottle that was still too cold, and in others it would be too hot, even when warming for the same amount of time and using bottles that were stored in the refrigerator for the same amount of time. So that got frustrating. We also found that this unit can build up scum in the bottom basket faster than many other units we tested, but realistically this is to be expected with any unit unless you're cleaning it out every couple days (which we suggest doing). So overall, this is a great bottle warmer, save for some little issues. But for only about $35 online, we are willing to deal with the drawbacks! Who else recommends the Dr. Brown's bottle warmer? Our friends at Babylist, WhatToExpect, and The Bump consider it a top pick! Interested? You can check out the Dr. Brown's Baby Bottle Warmer here.

8. Bubos Smart Fast Heating Baby Bottle Warmer.

best bottle warmer bubos

We were a little hesitant about this baby bottle warmer, mostly given the super low price around only $18. That seemed too good to be true until we actually got our hands on it and tested it out! It's a pretty impressive baby bottle warmer overall, offering simplicity, efficiency, and versatility. Features include a removable basket for warming jars of baby food or anything else that won't stick out enough on top to be comfortable grabbing it, a nice wide heating area, and an automatic turn-off for safety. Another nice little convenience feature is that the instructions are written right on the side, including how much water to put in for various heating tasks. Testing it was a breeze. All you need to do is add water and press the power button. Once you do that, it goes through the heating cycle (which was about 3-4 minutes typically) and then turns off automatically. There was no off button that we could figure out, so you need to wait for the cycle to complete for it to turn off. We were able to fit in all of the bottles we had kicking around in our shop - the Comotomo, AVENT, MAM, NUK, and Dr. Brown's. We tested it out with glass and plastic bottles, and it worked well for both styles. The only thing we noticed is that you'll need to add quite a bit more water when heating a thick glass bottle or glass baby food jar, and the cycle will take a bit longer than with plastics. The basket was easy to use when heating smaller items, though we tended not to use it at all because most of our bottles were wide neck and didn't fit in the somewhat narrow basket. Another thing we noticed is that it's not a good baby bottle warmer if you need to heat multiple bottles in succession, like if you have twins or want to heat some food and a bottle. The reason is that after a cycle finishes, the warmer won't turn back on for another 15 minutes. Cleaning isn't very easy given the caged design of the heating element. We did soak it with white vinegar and used only filtered water for heating, but did notice some discoloration on the heating element after a couple weeks. Other cons? There are printed water measurements on the inside but they're basically impossible to read without a flashlight. Other than that, it's a pretty good and inexpensive baby bottle warmer that's worth considering if you're on a tighter budget. Interested? You can check out the Bubos Baby Bottle Warmer here.

9. The First Years Quick Serve Bottle Warmer.

best bottle warmer first years

This basically a cheaper and simpler version of the Night Cravings bottle warmer. Coming in at only around $15, this does the job when you want a quick and easy bottle warmer. Like its big brother, the Night Cravings, it uses the measuring vials to add the right amount of water to the pot, includes a baby food warming attachment, and uses a one-button operation. It also fits most bottles, both wide and tall, but we did manage to get a short/wide Tommee Tippee bottle stuck down in it, which was a little challenging to get out. In contrast, an excessively thin and tall bottle will cause the steam to escape a lot from the sides, making it difficult to reach in to touch-test or swirl your bottle without getting your hand into hot steam. Not quite as reliable or consistent as the bottle warmer on the #1 version of the First Years warmer. For about the same money, we suggest going for the Goloho. But if you need an inexpensive solution that does a pretty reasonable job, this is a great bet.

10. Real Bubee Bottle & Food Warmer & Sterilizer.

best bottle warmer babebay

We are usually very hesitant to put newly released products on our lists, mostly because we can't be certain about long-term reliability. We put this brand new Real Bubee (or BabeBay brand) bottle warmer to the test earlier this year, and were very impressed. This is the only bottle warmer on this list that also functions as a bottle sterilizer, which is a nice touch. All three functionalities, bottle warmer and sterilizer, and food warmer, work really nicely. You fill the reservoir with about 200-300mL of water (just over a cup), and place in up to two bottles. The bottles can be tall and narrow (like the Dr. Brown's), short and fat (like the Joovy), or anywhere in between and they all fit into the warmer thanks to the wide base and tall lid. In our testing, we found that the more water you put in the reservoir, the longer it takes to heat the milk. With 200mL of water it took about 5-6 minutes to heat a plastic or glass bottle from room temperature up to about 100 degrees F. Sterilizing boils the water in the reservoir to create steam and kill bacteria from nipples and bottles. The food warming aspect is pretty clever: you flip the lid over and use it as a food bowl that fits perfectly into the reservoir; works nicely for purees, and gives a nice gradual heating rather than the suddenly-hot effect we find in the microwave. Overall, we found the device really easy to use, very simple and easy to clean, fast and efficient with water use. But there were also some downfalls. First, we're not sure about the long-term reliability, as this product appears to be mass-produced and sold under several different brand names. That's usually a bad sign, as it dilutes responsibility for product warranty, as one of the 5 brands will suddenly disappear and you might be stuck with a faulty product. Second, the power/status light on the knob was very dim and difficult to see for understanding when it was ready (green) or still heating (red). Finally, we didn't have this issue but there have been reports that the power management in this device isn't so great, and will blow fuses/circuits in older houses. In any event, we're going to give this the test of time and see how it goes. You never know, it might make its way higher on our list!

How to Pick the Perfect Bottle Warmer

Types of Bottle Warmers: There are three main types of baby bottle warmers. First, there is the typical home bottle warmer system that sits on your kitchen counter and uses steam to warm up your baby bottle. Second, there is the home bottle warmer system that involves heating a pot of water that your bottle sits in. Third, there is the travel bottle warmer that either plugs into your vehicle or relies on a thermos that you fill with hot water in the morning. Most parents buy the second and third options, to have the flexibility of a home bottle warmer and travel bottle warmer.

Mold and Slime: Many of the bottle warmers that use steam have a reservoir that you fill with water (like a Keurig), and parents report that those tend to get pretty disgusting and slimy/moldy if they are not cleaned every few days. This is especially the case when your household has hard water. We suggest using the type that involves placing water into a little pot and then placing the bottle in with it; then you have no reservoir and tubes to get all gunked up. Either way, you'll need to clean your baby bottle warmer on a regular basis. Most manufacturers suggest using white vinegar to descale the water reservoir, and we find that it tends to work pretty well (especially if you let it sit and soak for about an hour).

Safety and Milk Temperature: Heating a bottle full of milk is a tricky problem, because you want the bottle to be just a bit higher than the baby's body temperature (about 98.5 degrees fahrenheit, or 37 degrees celsius). Many warmers will over-heat the milk and then you have to wait again for it to cool down. This happens a lot when you're warming a bottle that is filled to a level that doesn't fit the warmer's settings (usually they have a couple options, like 4oz or 8oz). No matter which bottle warming technique you're using, to reduce the risk of burns always check the temperature of the warmed milk (we like to drip some on our forearm/underside of wrist) before feeding your baby.

Baby Bottle Sizes: Many bottle warmers tend to cater to the tall and narrow style of bottle. For instance, you can have a hard time fitting wide bottles (like a Tommee Tippee) into a Goloho bottle warmer, because the heating pot on the Goloho is just too narrow. So we suggest getting a warmer that will fit a variety of bottle dimensions; you will find that sometimes it takes trying several baby bottles and nipples before finding the best one (see our baby bottle and nipple buying guide), so you want to have flexibility in which ones will fit your new bottle warmer.

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