DD1 usually goes every 3 days, sometimes every 4. We have added prunes, dried apricots, raisins, craisins, and such to her diet and we find her poop is more frequent when she's adequately hydrated. Right now she's just so active that she hardly stops to take a sip of water or milk. So we are having to work really hard at increasing her fluid intake.
If he's not having a hard time with it...pain, blood, etc. then I wouldn't worry about it too much.
Mom to two amazing DDs ('07 & '09) and a fur baby.
Gluten free since Nov '11 after non-celiac gluten sensitive diagnosis. Have had great improvement or total elimination of: migraines, bloating/distention, heartburn, cystic acne, canker sores, bleeding gums, eczema on elbows, dry skin and scalp, muscle cramps, PMS, hair loss, heart palpitations, fatigue. I'm amazed.