Does your breastfed baby refuse a bottle with your thawed milk?
If your milk smells or tastes soapy or metallic, high lipase may be the reason.
Lipase is an enzyme that is normally present in human milk, and is not harmful in any way. It’s actually important for breaking down fats in the milk so babies can get all the fat-soluble nutrients and fatty acids that protect them from getting sick.
Lipase increases the longer milk is stored before being frozen. Milk that has a high level of lipase can develop a soapy smell and taste, but again, it is not harmful to the baby. If your baby starts rejecting the milk, scalding it before freezing will remove some of the lipase. See below