i actually saw a "child" like that before. he looked about 3 and was wearing diapers. but on closer look, he didn't have the chubbiness of a toddler or a toddler's youthful looks; arms & legs were actually a bit muscular, skin wasn't at all supple and his face was rather mature, bit like a teenager or young adult. it was in the 90s, on a bus in singapore. my friend who was riding the bus with me noticed it too. i think whatever he had is similar to what this girl has.