You cannot give him anything ma, there are different causes and only proper evaluation by a Paediatrician and/or an Orthopaedic Surgeon can determine the exact cause and the appropriate treatment.

It's best to see a paediatrician and orthopaedic surgeon. All issues will be clarified while ensuring that nutrition is improved.... milk, egg, oily fish, cereals that have been fortified with vitamin D. Finally, playing under the sun is helpful