Baby refused to feed while awake.

Hello Doctors... My 4 months old baby taking feed only during sleep, he refuse to have while awake (breast feed and bottle feed both) , is this normal? This started when he was 3 months old and he refused to take milk while awake/conscious, although he is hungry. I have tried to cuddle him, body to body touch while feeding him but none of it work. I have no choice so every time when is time to feed, I need to cuddle him until he is drowsy/asleep. He is gaining weight but not quite as much as he should be. Is my baby sick/has he got underlying health problem which are causing pain while drinking, ie throat / stomach discomfort? He just pushes bottle out with tongue and cries a lot if awake but will quite happily drink 120-150 ml if he half asleep. Pls suggest!!!!!Help!!