my son had this problem before. he vomits a lot of milk. and when doctor examine him, he had reddish throat and nose. so doctor said he has 胃酸倒流. he took 2 months of medicine. he was much better when he took medicine. and sleep better too, because 胃酸倒流 also affect sleeping. maybe you can try a course of medicine. don't worry. my son is doing well now after the medicine. i believe your baby will also recover soon.he just need proper treatment.