Not allergy related though. Milk protein is in a lot of things. If he hasn't had a reaction now to like cheese and ice cream and yogurt he's fine. If he's on formula then that also has cow milk in it soooo ya it's really so that you don't replace formula until they are one
I started just this week but with my first it took awhile. Just depends on baby. My second LOVES Dairy, and digests it great but my first didn't digest it right
Not until after a year because the protein in milk is very hard to digest and babies tummies can’t handle that until after they are a year old. Also....allergic reactions.