How do Bottle Warmers Work, Safely and Quickly

Samantha Griffith

Written by Samantha Griffith

Woman with Bottle warmer

Steam bottle warmer or baby bottle warmer is one of the accessories that you may need for your baby. You might be using this product since the first day of your baby. But, how do bottle warmers work is still a hot topic for many parents. Yes, they have seen how this product had heated milk, but the process may be unknown to them.

How  warmers help is quite simple, and it is straightforward to understand. The warmer has a central vessel where you can place your baby bottle, then fill it with water, and turn it on. The warmer has a material that heats the water, which will result in a heated baby bottle.

Why do you need a Bottle Warmer?

Are you using bottles to feed your baby? If your answer is yes, then that enough reason why you need a bottle warming product. Baby glass bottles must be cleaned and sanitized before you let your child use it. Some more reasons to get your bottle warming product are:

  • Your baby would love warm milk

Breast milk is heated and follows the mother’s body temperature. If you have fed your baby with breastmilk for months and you chose to switch to formula milk, you would want to continue feeding your baby with warm milk.

  • A bottle warmer is safer

Some mothers warm their milk using a microwave. But that is not safe and isn’t recommended since it can cause uneven heating and hurt your baby’s mouth. A bottle warming product is safer to use than a microwave.

  • A bottle warming product is faster

You don’t have to worry about hot water and running it to your baby’s glass bottles. The warmer can perform the heating for you, helping you save time and effort for this work.

  • A bottle warming product preserves nutrients

You don’t compromise of losing any nutrients from your milk when you are using a bottle warming product. This process is the opposite of heating breast milk in the microwave.

  • A warming product heats water bath

Warm water is also best for baby’s bathing, and you can prepare a water bath with the use of warmers. Just make sure that you have the right level of heat for the water bath to avoid accidents with your baby and adverse reaction from her.

Do you need to Heat the Milk at all?

The answer is NO. You don’t have to heat the milk for your baby at all. Though you are breastfeeding your child and she’s used with warm milk, you don’t have to do it as she gets older. If you start feeding your baby with room-temperature milk or water, she will never feel unhappy or develop negative feelings toward the person who fed her. Soon enough, she will get used to the different temperature of the milk. When she starts eating, she will enjoy every baby food that you give here without considering the heat. It is not wrong or harmful to feed your baby with room-temperature milk during her early months. If you manage this, it will be very convenient for you and your baby at home, or anywhere you are.

  • Use light strategically

The amount of light can set the mood of your infant. If they can see that their surrounding is bright and well-lit, it can make them feel that it’s playtime. It is advised that you install dimmer lights inside the room and utilize them during night time. You can lower the light in the evening to set the mood to sleeping hours.

  • Put them to bed when drowsy, not asleep

As a mother, especially those who are breastfeeding, you need to practice the art of timing. When you think that the infant feels drowsy, that’s the moment you put them to bed. If you can master this practice, the rest will be much easier for you and the newborn.

  • Give your child some time

Once you heard the newborn’s cry or voice through the best video baby monitor, give them some time before you attend to their needs. There are instances that they only feel the need to make a noise, but still wants to sleep more. If you jump to them every squeak that you heard, you will only wake them up more.

  • Do not look to the child's eyes

A simple eye contact between you and the infant can be a signal of playtime for them. If you see that the infant is in its sleep zone, avoid looking at their eyes as much as possible. You can keep your gaze to their belly and touch them gently.

  • Forget about the rules on diaper changes

You don’t have to change the child’s diaper every time they wake up at night. You will only wake them up more. If the newborn wakes up, sniff their diaper and see if they have pooped in it. If yes, then that’s the time to change their diaper. Use a baby wipe during nighttime to avoid fully waking them up.

  • Prepare yourself for changing sleeping patterns

The sleeping pattern of a newborn will change as they develop major milestones. When a newborn starts to see, it can keep them awake more often. As a parent, you have to prepare for sleep regressions because it will be part of your child’s growth.

A Bottle Warmer is Better than the Microwave

We all know that warmers and microwaves work the same when it comes to heating a baby bottle. But, there are many misconceptions when it comes to microwaves. Here are some of the concerns that you should address when using a microwave at home. 

  • Use light strategically

The amount of light can set the mood of your infant. If they can see that their surrounding is bright and well-lit, it can make them feel that it’s playtime. It is advised that you install dimmer lights inside the room and utilize them during night time. You can lower the light in the evening to set the mood to sleeping hours.

  • Microwave does not bring any harm or leaks and irradiate.

This fear of every parent is pointless because this is not true. The microwaves that you fear is the radiation used by radio and infrared.

  • The BPA will never go into your baby's milk.

Most manufacturers of baby bottles have stopped using BPA for their products. You may have seen bottles that say BPA-free, and you are rooting for this kind of product. For those bottles with BPA, you don’t have to worry that it will go to your baby’s milk. But if you can see cloudy plastic bottles used by your baby, you need to stop using it immediately.

  • Microwaving does loses the nutritional value of the milk.

Using a microwave to heat your baby’s bottle is a big mistake. Microwaving gives no effect to the nutrient composition of your baby milk and baby food. The truth is it can help in keeping the nutritional value of the milk since the heating time is short.

  • The microwave heats unevenly and creates hot spots.

Yes. This one is true. But there is no clear explanation of why this is harmful and dangerous for your baby. Typically, a microwave heats the milk unevenly because it agitates the water molecules. If you find that the bottle is unevenly heated or it developed hot spots, the best solution is to shake the bottle to distribute the contents evenly inside. You can also test the temperature of the milk before you offer it to your baby.

  • What temperature do bottle warmers heat to?

The best temperature for a warmer to heat to is lukewarm. Since the ideal breast milk temperature is like the mother’s body temperature, which is around 98.6 F or 37 C, the best way to achieve this heat level is by using lukewarm water. There are bottle warmers that come with a removable basket, and it will help you avoid contact with the water.

Is it OK to use a Bottle Warmer for Breastmilk?

It is perfectly OK to use a bottle warmer for breastmilk. When we talk about warming breast milk, it means that you want to keep it heat level somewhere between the mother’s body temperature and the room temperature, and the best way of doing this is by using a bottle warmer. But if you don’t have a bottle warming product at home, then you can warm the breast milk by placing it inside a bowl of warm water.

There are some guidelines that you should follow when heating stored breastmilk. 

  • When you have heated or warmed breast milk after storing it inside the freezer, your baby must consume it within 120 minutes or 2 hours
  • You have to store unused breast milk inside the refrigerator within 30 minutes after feeding your baby
  • Warm breast milk must be fed to your baby right away, or you can save the milk inside the fridge up to 4 hours
  • A partially used mother’s milk bottle that has been reheated once can be safely to reheated one more time. But if there is still some milk left after this, you have to discard it right away.

How Long can you keep a Bottle Formula in a Bottle Warmer?

The maximum time that you can leave your baby milk bottle inside a warmer is not more than 10 minutes. A bottle warming product is safe and convenient. But you have to make sure that it has a thermostat control for your baby’s safety.

It is perfectly fine to feed your baby with formula milk that is room-temperature or cold. But some babies would prefer warmed formula milk, and you can quickly achieve it with a bottle warming product. Check the milk temperature before you give it to your baby. 


How do bottle warmers work is effortless to understand. It offers many benefits for both the mother and the baby. With a bottle warmer, you can have a contact temperature that you will need for your baby’s milk. It is also very easy and convenient to use. And if you are asking whether you should buy a bottle warming product for your baby, then you should get a YES as a response. You will be surprised by how this product can make your life easier as well as your baby. You don’t have to worry about uneven heating and hot spots. Since it is very easy to use, you can warm your baby’s bottle with your right hand, while holding your little one with your left hand. That’s how amazing a bottle warmer can be. 

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