Although you may be concerned about the shape of your child’s legs, a slight degree of bowing or knocking is normal. That said, if your child exhibits any of the following, it is probably a good idea for a pediatric orthopedist to take a look: Excessive knee angle either inward or outward. Unequal knee angles. While slight variation from one side of the body to the other is normal, a large difference between one leg and the other should be investigated. Pain or other complaint connected to the knee angle. Bowlegs after 3 years of age. This is when children have the greatest amount of knock-knee alignment and, therefore, bowlegs would be abnormal at this time. Knock-knees at an angle greater than 15 degrees.