I wouldn't worry. DS was 23lb by 3 or 4 months, and at 12 months he's now 25lb. He can still wear clothes that he wore at the end of last summer. He's happy and healthy and still nurses just as much as he ever did, he's just growing up rather than out. He's still chubby, but he's very obviously thinning out. I'm not sure where the change came from, though. He didn't start crawling until almost 9 months, and while he cruises like crazy, he still isn't quite walking yet.
4/5/10 at 2:59pm