LO has been doing fine with the poop and then didn't go Monday or TUesday and then today he did a little hard thing that he was crying doing. What can I gave him to clear this up except for just prunes?

Me: 37 DH: 39 DS: 4
TTC #2 - Experienced Miscarraige on 3/5/13, DnC on 3/11/13
Re: constipation
Ok I gave him a container of prunes this evening with his dinner and then my mom will gave him for lunch tomorrow if he doesn't go in the morning.
Me: 37 DH: 39 DS: 4