Try burping him, soothing him, or moving his legs in a circular motion. Try talking to his doctor about the type of formula he drinks. He may need to be switched unless he is breastfed. If he's breastfed try eating fruits and green vegetables. It'll help him gas or poo. He may have colic as well
If he is on formula it might be upsetting his little tummy , and when was the last time he pood ?
He Could have gas. Try moving his legs like he is riding a bicycle.and burp him after every oz.