Your child may be carrying too much in their backpack and it could cause permanent spinal damage. According to recommendations, kids should only carry 10 percent of their body weight on their backs. One doctor who was interviewed said most kids and teens are carrying at least 20 to 25 pounds of stuff in their backpacks. Kids won’t complain and usually don’t feel pain. Parents need to keep an eye on their child’s posture and the way they walk for changes in their spine. Damage can be corrected early with exercise. Bad cases may require back braces.