I have been very impressed with seeing how different children can be. I'm not sure the doctors looked any further than one child when they made up the rules for what is "normal." At my son's 6-month check-up, the doctor told me that he was going to need weight checks every week and that I needed to start feeding him more. But the doctor never got the chance to see my husband, to see that my son was just taking after the skinnier frame that my husband has. The doctor should see my baby now! He is a porker! His legs have turned into rolls and when he sits up, he looks like a little Buddha doll. It's good to have the reassuring voice in the back of my head telling me that not all babies are supposed to be average.