Now a days,My 3.9 years boy complaning of back waist pain..what to do??He is very thin,doesn't want to have any food..

A. hello mom first of all make sure child is having healthy and nutritional diet 9f he is not willing to have u can ask ur doctor for medication of appetite like aptivate and for pain u can give massage with warm oil age is very small small u can even ask doctor for supplements like Iron and Calcium