Rickets was before very common in China, Japan and countries around. A big percentage had deformed and short legs, and were very short in general. People say it's genetic.... I'm not so sure. I see now the new generation become taller and with a good "bone built" body and good legs.
Tofu, soy were a famine food, not really because they wanted it, but because many of these countries were going through hard times, wars, dictators etc... Too much rice/grains and soy and very little or no meat, generation after generation made their body bone structure deformed.
Actually the biggest harm to vegan children is a slower development of brain/mind, there have been more than one example of this.
This child could maybe start to grow normally again, but she will have a bit less chances to develop as others, as harm´s already been done.
Another thing that people don't realise, is that the food habits of both the parents, before the birth, has an impact on the foetus and the child later.
A child that had parents eating lots of meat, and having lots of nourishing foods during the early years, but then going vegan in her/his teens can seem to do very well for many years. The body has amazing reserves, and many vegans are often people coming form a background were parents ate lots of animal fats and proteins.