What was the birth like? Sorry I can't remember and I really HAVE to get to bed otherwise I'll regret it tomorrow! If he had a traumatic birth he might still be healing from that. Also if it was physically stressful on him he might need outside help, see if you can find a chiro who specialises in babies Some people swear by it if bubby had a rough entry into the world.
I can second this - Archie and I obviously had a traumatic birth, with the vacuum used in the end. Archie then had trouble latching on the RHS boob, until we saw a paediatric chiro who did some adjustments and VOILA, we had perfect attachment on the RHS (cradle-hold and football-hold) within 24 hours. We think his position in the womb and the vacuum might have given him a neck pain, but the trauma of the birth itself cannot be underestimated. Now, I'd never seen a chiro before I had a treatment the day I went into labour, and I've always been skeptical of chiros (I prefer myotherapy, osteopathy and acupuncture) but I cannot deny that our chiro helped immensely with Archie's RHS aversion, and probably helped him engage in my pelvis before the birth too.

Weigh-in yesterday - 4.186kg, which is an 820gm weight-gain in the month since birth. Oh, and me and Mr Archibald are heading to BabyROO (Baby GymbaROO) next week!