Guidance on cow’s milk can be confusing, so we’ll try to break it down here.
First, foods that contain cow’s milk, such as yogurt and cheese, are safe to eat and, in fact, are encouraged so that your baby is regularly exposed to dairy–which helps reduce the risk of future dairy allergies. Second, it is fine to offer small amounts of cow’s milk, mixed with food or given in a cup, to babies 9 months or older.
Cow’s milk does not contain enough iron for infants compared to infant formula or breastmilk combined with oral iron supplements. Babies who consume cow’s milk can thus experience iron deficiency anemia which, in turn, can negatively affect development. In addition, infants under 6 months have less mature kidneys. The higher load of minerals in cow’s milk may result in kidney dysfunction among these littles.
So, in summary: cow’s milk is not a replacement for infant formula or breastmilk and should be avoided among very young infants. However, limited exposure among older infants is safe and, in the form of yogurt and cheese, it is recommended in order to reduce the risk of future dairy allergies.
You can find more information here.