The key to diagnosis is to determine what level in the leg the intoeing is occurring at.
Intoeing is evaluated by looking out for abnormal sitting positions.
Your doctor will take a thorough history, especially regarding birth history and developmental milestones. Any history of pain or limping should be discussed.
The physical exam will include watching your child walk and run, and checking range of motion of the hips, knees, ankles, and feet. He or she will also do a neurologic examination to check muscle tightness, nerve / muscle function, and coordination. He or she will also note whether your child has femoral anteversion, tibial torsion, or metatarsus adductus.