My baby has reflux since he was 2 weeks old recently they had to put him on medication (zantac 1 ml twice a day) because she is refusing to eat. Everytime i feed him he fights so much, he sticks his tongue out, he moves his head side to side, he spits the milk out, He is on nutramigen and I also try to give him my breast or pump and give it to him in a bottle and he doesnt want it either. The zantac did not help at al. His GI Doctor put him on compound omeprazole 2 ML twice a day, we started today. How long does it take for the omeprazole to start working because im desperate seeing him like this.