How often should I sterilize baby bottles? Our ultimate guide.

Baby bottles are an essential part of raising an infant. However, the sterilization of those bottles is an important step that should not be overlooked. In this article, we will provide an ultimate guide to answer the question ‘How often should I sterilize baby bottles?’

The Importance of Sterilizing Baby Bottles

Before we dive into the details of how often to sterilize, it is important to understand why it is necessary. Babies have a weaker immune system than adults, and they are more susceptible to infections and diseases. Here is why:

  • Babies put everything they see in their mouths, increasing their chances of ingesting harmful bacteria
  • Their immune systems are still developing
  • Baby’s stomachs have less acid, which makes them more vulnerable to bacteria

Therefore, sterilizing baby bottles is essential to prevent food poisoning and other bacteria-related illnesses.

When to Sterilize Baby Bottles

Before First Use

New baby bottles and nipples should be sterilized before the first use. This is because, during the manufacturing process, the bottles may have come into contact with dust, germs, and other contaminants.

You can sterilize a new baby bottle by boiling it or using a specialized sterilizing machine purchased from a baby store.

After Every Use

Baby bottles must be sterilized after every use until the baby is at least six months old or until their immune system is stronger. This is because milk or formula can leave residual bacteria in the bottles.

When the Baby is Sick

If the baby is sick, it is important to sterilize their bottles and nipples after every use. This will prevent the spread of bacteria and other germs, which could infect the baby further.

How to Sterilize Baby Bottles


You can sterilize your baby’s bottles and nipples by boiling them in water. Take note of the following steps:

  • Fill a large pot with water and submerge the baby bottles and nipples into the water
  • Boil the bottles and nipples for at least 5 minutes
  • Use a pair of tongs to remove the bottles from the pot after 5 minutes and place them on a clean towel to dry

Boiling may not be suitable for plastic or silicone bottles, as it can damage them. Before boiling, check your bottle’s instruction manual for suitability.

Sterilizing Machine

Sterilizing machines use steam to kill germs and bacteria in baby bottles. Here is how to use a sterilizing machine:

  • Fill the machine with water as instructed in the manual
  • Place the bottles and nipples into the unit according to the manual’s instructions
  • Turn on the machine and wait for the sterilizing cycle to finish
  • After the sterilization process is complete, take out the bottles and let them dry on a clean towel

Microwave Steam Sterilizers

Microwave steam sterilizers are another convenient way of sterilizing baby bottles. Here is how to use a microwave steam sterilizer:

  • Add water to the sterilizer according to the instructions
  • Place the bottle nipples and bottles in the sterilizer as per the instructions
  • Put the sterilizer into the microwave and heat for the recommended amount of time
  • Let the sterilizer cool before removing the bottles

Microwave steam sterilizers may not be suitable for some microwaves. Also, be careful when removing the sterilized items from the microwave. They will be hot.


Sterilizing baby bottles is an important step in keeping your baby healthy. Boiling, steam sterilizers, and microwave steam sterilizers are efficient ways of sterilizing baby bottles. Remember always to sterilize new bottles before use and to sterilize used bottles and nipples after each use.

The Most Common Questions About Sterilizing Baby Bottles

  • How often should I sterilize baby bottles and nipples?
  • Baby bottles should be sterilized after each use until the baby is six months or as per your pediatrician’s advice.

  • Can you use a dishwasher to sterilize baby bottles?
  • Although a dishwasher can help clean bottles, it does not sterilize them. Use a sterilizing machine, boiling, or microwave steam sterilizer for sterilization.

  • Do I still need to sterilize bottles once my baby starts solid foods?
  • After the baby is six months old and starts solid feeding, sterilizing baby bottles becomes less necessary. However, it is still important to sterilize the bottles until the baby is at least one year old.

  • Should I put the bottles and nipples in the sterilizer separately?
  • No, you can sterilize them together. Just make sure they are correctly placed in the sterilizer to avoid leakage.

  • Can I use vinegar to sterilize baby bottles?
  • Vinegar may remove some bacteria from baby bottles, but it doesn’t sterilize them completely. Use a sterilizing machine, boiling or microwave steam sterilizer for complete sterilization.


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