Well if you need to fatten her up, then I need to fatten DS up. He's 19 months old and barely weighs 10kg. Can't tell you his height. Same as Mel & a few others, anyone can see he's lean - you can see his ribs etc....but that's just him. DP & I are lean too. He's extremely active, talks non-stop and happy & healthy in every other way, so I'm not going to push poo uphill to try and force feed more into him. He's going through a fussy stage at the moment....he'd live on dairy (in particular yoghurt) right now if we let him. What else can you do?