Thanks for writing to health care magic.
Leg pain and pain in the calf muscles is common in the age group of your child.
Most of the times these pains subside as the child grows older and require no significant treatment.
A simple massage
is all that is required most of the times. Some times if the pain is severe paracetamol
may be given.
But the numbness
your child is complaining of requires examination by a doctor.
Request you to get your child examined by your doctor for the needful.
Hope this helps.