It's could be digestive issue. Tray massaging on the stomach gently , make your baby do bicycle exercises, if the baby is crying alot and it involves him screaming .it could be colic . Occurs in a few babies and it normal . Try comforting him

This can be colic pain. Its basically the gases or discomfort faced after feeding. Colic is when a healthy baby cries for a very long time, for no obvious reason. It affects some babies during the first 3 to 4 months of life. Colic usually begins suddenly, with loud and mostly nonstop crying. Colicky babies can be very difficult to calm down.