A friend just found out at a well-baby check-up that her 9mo babe has dropped from the 50% in weight to the 24% (not sure exactly but roundthereabouts i think). Her ped was concerned, but his only suggestion was to feed her more -- "lock her in her high chair and *make* her eat."
My friend bf's, but they do have some trouble -- she's got one of those babies that don't won't eat unless they're sitting quietly in their bedroom at home during the day, but is up every 2 hrs at night. So more solid food may be the answer. My friend is a conscientious, well-informed parent, so presumably she's offering healthy food 5x a day. What else can she do? Her babe is a very active, and glowingly healthy, so it may just be normal, but she does seem a little small, especially in comparison to the pre-crawling chunker that she once was.