Sounds like a growth spurt to me, but like pp said, could be lots of things. If he's reacting to the shots, he'd probably have a fever so you can rule that out easy enough. My daughter only woke up once in the night, then right around 4 months started waking every 2 hours. She had a bit of a cold, but I think it was mostly a growth spurt. So I fed her when she woke up, then gradually got her to go back to sleep without nursing, one feeding at a time. Unfortunately the "sleeping through" milestone comes and goes, especially when it's this early.
at 9:32 AM on Apr. 15, 2009