Join Date: Nov 2007
Location: Downtown San Jose, Calif
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My DD2 just turned 5 months, and she also weighs around 12 lbs. She's just starting to slim down a bit and look a little less chunky. Her birth weight was 4lbs, 13.5 ozs. I wouldn't worry a bit about your son. I think he's around the 10th-25th percentile. My oldest was always 5 percentile, and the doctors didn't worry until she was gaunt and well below zero percentile.
I don't know how useful it is to just compare him to other 5 month olds, since babies are SO different in terms of how they gain, what their birth weight is, and there's a wide range of normal. DD was around 19 lbs at 5 months, but she's also always been above the 95th percentile for weight, and was big when she was born - so she's hardly representative of what a baby that age "should" weigh (if there is such a thing).
I think if your ped isn't worried, you shouldn't be either.