try feeding him in an upright position to help him digest as he is eating( is BF i used to sit on a pillow and sit the baby in a football hold down the side, or sit cross legged and sit him in your lap and feed him so he is sitting up). Also are you breastfeeding?? If so, take out acid forming foods from your diet, honey, tomatoes, strawberries, tomatoes, chocolate etc. Also bread with preservative 282 affects a little one. I don't eat anything from the brasica family in the first 2-3months which is onion, garlic (any onion family), brocolli, cauliflower.... this makes a HUGE difference to babies digestive processing.

I hope he settles down soon for you, you could pop him over your arm facing away from you to burp him, on lay him on your chest in an upright position to help him get the food down.