C.C.
It sounds like he may be a little constipated. Bananas, applesauce and cereal have a tendency to cause this. If you give him some prunes daily, he will most likely overcome this issue. I've heard of babies who don't poop for a week or more....and doctors aren't alarmed. But, for your baby's comfort, I would suggest introducing prunes to help ease difficulty in pooping. Best of luck!