Breast pumping: How to store and reheat breast milk
Breast pumping is a great way to help you have a consistent stock of breast milk ready for when your baby needs it, even when you aren’t able to breastfeed. Once you understand how to store and reheat breast milk, it will give you a lot more flexibility; helping you plan feeds not only around your baby’s routine, but your own schedule too.
Once you have expressed your milk, you can store it in the refrigerator or freezer in sterilized containers or special freezer bags made specifically for breast milk. It’s a good idea to leave a 2cm gap at the top of containers or bags to allow for the milk to expand in the freezer - also helping to reduce the risk of messy leaks. It’s also advisable to write the date you expressed on each container, to help you keep track of your stock, and you should always use the oldest milk first.
The length of time you can store breast milk depends on your method of storage. In general the below rules are recommended.
- Room Temperature: 4-6 hours at 66-78 °F (19 – 26 °C)
- Cooler with Frozen Ice Packs: 24 hours at 59 °F (15 °C)
- Refrigerator: Up to 8 days at 39 °F or lower (4 °C)
- Freezer: Up to 6 months at 4 °F or lower (-18 °C)
It can be difficult to know how much milk to store at first, especially as you are getting used to your baby’s feeding habits, however, here at Elvie we find mom’s normally pump around 3-4oz a sitting. These smaller quantities can be stored easily and thawed quickly and can also be combined if needed.
It is totally normal for breast milk to separate when stored in the fridge or whilst it has been frozen, or to be thin with a bluish, yellowish or even brownish colour. However, if your milk has a strong rancid smell or continues to separate even when swirled - whether straight from the fridge or after thawing - it is likely it has gone off and you should not give it to your baby.
If you have decided to freeze your breast milk after expressing, it’s important to thaw it fully and safely before giving it to your baby. The NHS website recommends thawing the breast milk slowly in the refrigerator for around 24 hours before you intend to feed. However, in cases where you need to defrost the milk swiftly, there are a couple of options - either hold it under running lukewarm water or swirl it in a jug of lukewarm water.
Whilst it may be tempting to head for the microwave, most medical advice strongly recommends against that. Whilst defrosted breast milk is still good for your baby, microwaving can damage the valuable proteins in the breast milk, reducing the nutrients your baby gets from it.
Thawed breast milk can be kept in the refrigerator for up to 24 hours but it’s very important not to refreeze it.