A couple’s young sons both experience sudden reversals in their physical development, leaving doctors scratching their heads. Nobody understands what’s wrong, because on the surface, the boys seem perfectly fine. But to find the answer, they have to look much deeper.

Follow MrBallen's Medical Mysteries on Amazon Music or wherever you get your podcasts. New episodes publish for free every Tuesday. Prime members can binge episodes 57-64 early and ad-free on Amazon Music. Wondery+ subscribers can listen ad-free--join Wondery+ in the Wondery App or on Apple Podcasts.

See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.