EBF Baby & Stomach Pain

Lu

My son is almost 4 weeks old and for the last week or so we’ve been having problems with him crying and being inconsolable. His tummy feels hard And he’s grunting like he’s trying to poop but he can’t. It usually starts around afternoon time and lasts well into the next day. I’ve tried has drops and gripe water and nothing is helping. Any suggestions would be great.