Frozen breast milk will be stratified. If heated after shaking, the taste of milk will be heavier than that of fresh breast milk, and the sweetness will be slightly lighter.
Frozen breast milk will turn more yellow, and it will be very fishy after melting and heating! Adults can hardly accept the fishy smell, and I can't wait to spit out my breakfast after taking a sip. But for most children, it tastes good and seems to be confusing. Some sensitive children will refuse to drink frozen milk.