I think every baby is unique. My son was taking a 10 to 20 min nap every two to three hours, then one long one around 1 or 2 in the afternoon. He was sleeping for about 6 to 8 hours at night. Now, at six months, he's taking a ten to twenty minute nap about 2 hours after getting up around 8 in the morning. Then he takes a 2 hour nap around 1 or so. Sometimes he takes a quick nap in the evening as well before falling asleep for the night at about 7 or 8 pm.

I just let him tell me what he needs. I find that the less I hold him and the more I let him play then the better he sleeps.