Please don’t be anxious. Hopefully your baby has no problem because pain is not persisting constantly. I am sure that pain is not hampering his daily activities as well. When he complaints of pain please do check tenderness by firmly pressing over the area. If it is really tender your child will winch with pain. Your child may have tenderness or not. If tender it may be traumatic during play. Try to notice any other body symptoms along with pain like fever, swelling of the affected area, limping of gait etc. Some pain only appears at night. If there is no other significant association keep observing. Don’t ask your baby about pain. Let him tell about pain. You can give Paracetamol for relief.