N.Z.
It is completely normal, my daughter sometimes only goes once a day. When I called her ped when she hadn't gone one day he said to give her 1 oz prune juice mixed with 1 oz of water. Prune juice worked wonders and it was quick too!!! If his poop is really hard you might want to give him a little bit of juice, maybe not even that much, just so he doesn't get a hernia from pushing.