Does your child complain of achiness in their legs at night? Pain in the upper or lower legs or behind the knees can occur during periods of rapid growth in kids, usually between the ages of 3-5 or 8-12. Recent studies have found a high incidence of these ‘growing pains’ in children with flat feet. As your child’s body weight increases with the rapid growth, their foot arches may not be strong enough to maintain that extra weight. Correcting the arches with custom foot orthotics can help ease some of the muscle soreness. When combined with warm massage, increased fluid intake, stretching, and ensuring that stable, supportive footwear is worn throughout the day, you can greatly ease your child’s discomfort.