What type of protein is in breast milk?

Breast milk contains two main types of protein: whey and casein. Since whey proteins are easier to digest, breast milk is naturally whey-dominant. The whey-to-casein ratio starts at 90:10 in colostrum — the first milk packed with concentrated nutrients — and gradually shifts to 60:40 in mature milk (around 6 months), ensuring your baby gets exactly what they need at every stage of growth.