Has anyone else here had a child who struggles to gain weight. My 17 month old, was only 4lb at birth but now is still only 13lb7oz. She seems to lose weight as quickly as she gains it. so, in the last six and a half months she has only put on 1lb. Has anyone had anything similar? If so, what did the drs do / not do? What advice was helpful (other than, don't worry!)?