Anything you store your expressed breastmilk in should be ‘food-grade’ and BPA-free:
plastic cups with tight-fitting lids
small glass jars.
If you have a premature or sick baby, ask the hospital staff about containers, as they may supply them. Talk to your doctor or midwife about any extra steps you should take when handling or storing your milk. Breastmilk is best supplied fresh daily for a sick baby.
Seal the container of expressed breastmilk (EBM) and clearly label with the date. Place the container in the coldest part of the freezer.
If you want to add freshly expressed breastmilk to some that is already chilled or frozen, you need to first cool it in the fridge. Add it, then put it straight back into the freezer or fridge.
The following are guidelines for storage of breastmilk.
Important safety information about storing expressed breastmilk
Breastmilk should not be frozen or heated more than once. Store, defrost and offer small amounts of EBM at a time to your baby to avoid wastage. Any EBM that your baby doesn't take at that time will need to be thrown away. If your baby needs more, prepare another small amount.
You may need to carry your EBM – between home and hospital, home and work, home and your baby's carer. The climate and the length of your travel will influence what you may need to do with your EBM.
If your breastmilk is freshly expressed (that is, it hasn't been frozen), it is safe for use for 6 to 8 hours when kept below room temperature (<26 degrees C) or for 72 hours when stored in the refrigerator.
In the cooler months or if you only live a short distance from your workplace, you may not need to do anything special with transporting it. Just remove your expressed breastmilk from one fridge and place in the next fridge or freezer when you arrive.
If it's a warm day or if you have a longer drive, you will need to keep your milk cool during travel. You can carry your breastmilk safely in an insulated container with a freezer pack inside. A small bottle will even fit inside a wide-mouthed vacuum flask, with ice added to keep it cool.
If the milk is frozen, don't let it defrost while being carried. If it does thaw, use it within 24 hours. It is not safe to refreeze the milk.
© Australian Breastfeeding Association April 2022
Read more about expressing and storing
Evidence-led info and practical tips from our Breastfeeding Information Series