The child does not digest cow's milk, eats mainly during sleep

Hello. Please help me with this question: a child was born, in the maternity hospital and after the maternity hospital they were in a mixture of Nan Optipro, strong rumbling began in the stomach, green loose stools, weight gain was 1 kg. Moved to Nestozhen. Weight gain 700g. White lumps appeared in the feces, passed the analysis on a coprogram. The doctor said: complete non-digestion of cow's milk. Switched to Cabrita. After some time, the child began to abandon it. Weight gain 500g. The child stopped eating in the waking state, it was necessary to feed only when he sleeps. Switched to Nutrilak Premium Hypoallergenic. Weight gain is also 500g. Now also eats only when asleep. In a sleepy state eats the most 130-140 g, in the waking state 20-30 g. Child 4 months. During feeding, he twists his head, pushes the bottle (even in a sleepy state). And now this mixture began to eat badly, the largest 100g. Chair once every two days. What should we do? Again, change the mixture? On what? The doctor said that digestive problems, enzymes are necessary (Kreon), we drank them, also drank Atsipol twice. Please tell me what to do, how to be. And why does a child eat when he only sleeps? And another question: a child is 4 months old, he has no support on his legs. You put, he presses his legs and does not get up. What to do in this case? Thanks a lot in advance.