I have an 18 month old son who recovered from the stomach flu about one week ago. For the past 3 nights, he wakes up 2 hours after we put him to bed, and vomits up his whole dinner. He is otherwise fine, no diarrhea, no fever, normal during the day. He is not on any medications, and he has been drinking milk fine up until this point. Is it possible to "develop" an intolerance to milk? Anyone have any insight as to what could be causing this? Thanks.