Gripe water and 2% milk not so much dairy if he is off formula and try a kids pro biotic..also apple prune juice by Gerber..my baby had the same issue.

My daughter had the same problem, if you give him a lot of dairy or cheese cut down on that and give him one to two whole prunes with each meal or a glass of prune juice it helped kimber a whole lot...

My son was the same. They put him on lactose free milk. He does better now than he's ever did but he has times when he has kinda hard stools. I warm pear juice and sometimes put a teaspoon of karo in it and give it to him or I'll give him prune juice sometimes. neither really works for my son though

Prune juice