Why does my breast milk smell funny after thawing?
Breast milk may develop a strong smell after refrigeration or thawing. The smell has been described as metallic, fishy, rancid, or sweaty. One possible cause is an enzyme in breast milk called lipase. The enzyme causes changes in milk fat. The smelly milk is still good, but some babies refuse to drink it. To prevent the smell, mothers can scald the milk. This is done by heating the milk in a water bath to 62°C (145°F) for one minute or for 80°C (180°F) for 15 seconds. It is then cooled quickly and place in appropriate storage containers.