My two month old was laying on his play mat

Patient: My two month old was laying on his play mat in front of my couch were i had been sitting. He was laying on his back when my two year son stepped off the couch and right on my infant. His foot landed right about were you would place fingers to preform cpr. He weighs 40lbs. I dont believ he put all his weight down as his upper part of body was still on the couch. I have checked ribs to see if i could feel any thing unuasl and couldnt find anything. Nor have i notoced any bruising. He is breathing fine, should i be concerned and take him to local hospital to be checked out?

Doctor: