My 7 year old son is extremely skinny. There is no fat on him at all, just skin, bone and a bit of muscle. He's so thin that no trousers fit him unless they have one of those adjustable waists and he can still get into age 2-3 pants (but he is the normal height for a 7 year old).
His chest bone sticks RIGHT out so you can not only feel it, but actually see it.
Nurse has said he IS underweight but not to a worrying level (he weighs 3 stone).
BUT he is also having a lot of stomach complaints. He constantly says he has a stitch towards the side of his stomach (alternate sides) and he often has diarheah ... but he eats like a horse.
Is it anything to worry about or should I get it looked into? he's VERY lively so it doesn't seem to be affecting his health (other than these stitches).