My thawed breast milk smells fishy (not soapy or like bad cheese). Is it okay to give my daughter?

Yes. It is normal for thawed breastmilk to smell or taste fishy or soapy. The change in frozen milk taste or smell is due to excess of enzyme lipase in the milk which break down the milk fat soon after the milk is expressed. Most babies can accept a mild change in taste. If your baby rejects the change of milk taste, you can mix thawed milk with freshly expressed milk to lighten the change of taste. Test the taste of your breastmilk before giving them to your baby. The milk should not taste sour. It is spoiled if it tastes sour. http://kellymom.com/bf/pumpingmoms/milkstorage/lipase-expressedmilk/