there is much on the internet about hypotonia ( Low Muscle tone) heres one site pedclerk.bsd.uchicago.edu/hypotonia.html- I also suggest you put this question onto the expert/doctor forum .go back to the forums page and look to your right ..For diet I would suggest . pasta , rice, eggs if you eat them, juices, cereals ,yoghorts , puddings, whole grain bread,cheese, you can research more about feeding vegetarian children on the internet.good luck