Hello Doctor, My baby is 4 and a half moth old.. I think his stomach is not getting full with his mother's milk, and he is not taking formula milk.. and after giving cow milk to him, he vomits a lot. we give him burp by keeping him in upright position for more than 20mins, then also he vomits curd like substance..we think he has some problem with his digestion.. he feels uncomfortable after feeding and he also didn't put up weight from last 2 to 3 weeks... please suggest what to do