my sister's daughter 7 years old... she always crying for legs pain in night... anything serious to check or it's usual in that age.. she also looks very thin and very playful

A. There are two things associated with this pain once it is called a growth pain which is common with kids at the time of growth because the bones are becoming big the body is taking structure so it could be because of that and second reason could be due to deficiency of vitamin D3 and B12 so get it checked and start with necessary supplements