i too have a march 08 baby DS and he weighs a 10.2 kg hes tall and thin i get questioned everytime we go to the doctor wether i feed him enough etc etc, hes fussy he hates meat will eat fruit vege and chicken but only small portions. He was born average size but thinned out pretty much right away. to get extra calories into him we have fruit smoothis and i add yoghurt and sustagen to them, hes very active and does have muscle tone in his arms but he looks so thin everywhere else. also gets sick regularly.

on the other hand my DD 18 mths eats like a horse and i only weighs 8.2kg again i get questioned at every gp visit, and she eats more then most her age.

i think as long as they remain on their own line in the health book, and they continue to gain weight then thats all that matters.