D.O.
Hello Mom! I too have had ankles that slightly turned out to either side as a child. My young parents never addressed this. I had chronic leg pain throughout my childhood and teen years. (My left foot is worse.)My parents called it growing pains and fed me aspirin. THANK YOU for noticing and addressing this for your child now!!! As an adult I've consulted several professionals. My feet still turn out and my overall leg pain has concentrated itself in my joints, (ankles, knees, hips.)Also, I have flat feet. I don't know if that was always the case or if that was a result of walking on the insides of my feet. The best, long-term, and immediate remedy for me has been custom insoles. (You receive a box of foam, step in the foam leaving impressions, mail the box back, and receive custom insoles based on the impressions and a questionnaire. About $150 for the first pair. I bought mine from www.orthoticsdirect.com.
According to many online sources you may be able to nip this in the bud by seeking professional orthotic help now.
Best Wishes!
Mom