My baby girl is 4 months old. She is crying during feeding and not drinking the milk properly. Once i took the baby and put it on my shoulder she gradually stopped crying.What may be the reason?

A. Usually it is due to stomach pain that the child cries and they get quiet after a while when they get little comfortable but mostly they cry non-stop and sometimes the child is hungry and try to feed them they don’t accept when they cry because I don’t want to feed and when you put the child on shoulder there more relax because it helps in better digestion if you given any milk already