Mine is a totally different situation but thought it could help a little. DD was born at the top of the weight chart but had problems putting on weight. She rapidly dropped on the weight chart until under 3%. At first her length managed to stay on the normal side but it fell behind too. Her head remained normal sized so she was a retty skinny looking with a big head. Her legs have always been on the shorter side, but I think that is just normal for her, her dad has short legs too. Eventually her problems were resolved and she piled on weight and shot up in height too. She is now large for her age at 2 years. In her case her body knew the head was the part that needed to grow the most and the rest could catch up later.