Bowlegs
Many newborns have bowlegs, but that is usually resolved by the age of three. In fact, the bowing is often more illusion than real. Toddlers hold their knees flexed as they walk, but when you lie them down and press the knee back, all appearance of bowing is lost.

Treatment
Special shoes do not help bowlegs, and there is rarely a reason to treat bowlegs with braces. Still, bowlegs should be monitored. By measuring the distance between the knees, with the ankles touching, it is possible to determine whether bowlegs are worsening, at which point treatment may be needed.

Your doctor may order an x-ray to determine if there is a bone disease causing the bowing. If there is, then braces or surgery may be needed. Otherwise, as already noted, treatment is rarely required.

Bowleg is common under the age of two years and usually straightens by itself.

Knock-Knee
Knock-knee is a very common condition in children between ages three and five. It generally goes away without treatment, and braces or special shoes are rarely needed.

To assess natural improvement, take photographs or measure the distance between the ankles, with the knees touching, every three to six months. As long as the distance between the ankles is less than four inches, bracing will not be prescribed.

Sometimes older children between the ages of five and eight appear to have knock-knees, but it is usually due to their being somewhat overweight.

Knock-knees that involve only one leg or occur in adolescence should be examined closely. Braces or surgery may be needed if the condition is severe and interferes with walking.

It is normal for adults to be a little knock-kneed.

Knock-knee is common between the ages of two and seven years.

Fifty percent of normal three-year-old children have one-two inches between the ankles; twenty-five percent have more than two inches.

Most legs are straight by the teens.