my baby is 3yrs and 5 months old. He frequently complains of his leg ,knees and foot pain. Today he is having acute pain near pelvic bone.what to do

A. hi it seems like your child is having vitamin D 3 and vitamin B12 deficiency you must consult your pediatrician it is very important and get it checked make sure your child takes enough rest. give curd , buttermilk,,ghee,milk etc more provide apt sunlight (early in morning) for 20 minutes a day avoid giving RO water