Girls, can you please tell me. How much does your baby eat on GVB? We'…

Girls, can you please tell me. How much does your baby eat on GVB? We're two weeks old and he eats 50g according to weighings, the doctor says it's little, we need to supplement with formula. I don't want to (( He sleeps for 3-4 hours calmly even after each feeding, and goes to the toilet afterwards. I don't know what to do, should I supplement or not. Please advise from your experiences ??