Store breastmilk in a sterilised bottle or container with a lid, or clean plastic milk freezer bag, and label with the amount and date. Don’t fill a container more than ¾ full before freezing (see also ‘Cleaning and sterilising’).
Warming chilled breastmilk
To warm chilled expressed milk taken from the fridge, simply place the bottle in a bowl of warm water. If using a microwave to heat milk, shake the bottle after heating as microwaving heats milk unevenly (and may also change the composition of the milk). To avoid burning baby’s mouth, test the temperature of the milk to ensure it is only luke-warm by allowing some drops of the milk to drip onto the inside of your wrist. Discard any remaining milk after completion of feeding.
Do not microwave breast milk, as microwaving heats unevenly and the milk may burn baby’s mouth.
Thawing frozen breastmilk
To thaw slowly, place the bag or bottle in the fridge. Keep in fridge up to 24 hours.
To thaw quickly, hold the bag or bottle under warm running water. Use within 4 hours..
Note: Do not refreeze milk once it has been thawed.
National Health & Medical Research Council (NHMRC) Infant feeding guidelines – Information for health workers, 2013. https://www.nhmrc.gov.au/about-us/publications/infant-feeding-guidelines-information-health-workers, retrieved December 2014
Chapter 1 Baby Basics