The Horse Boy
This movie is about a family whose 2 year old son has autism. They go on a journey to Mongolia to find a cure. The boy, Rowan Isaacson, loves horses.
On the way they ride on horses and Rowan surprisingly rejects them and rides in a van instead. Eventually he gets on a horse with his dad and rides the rest of the way. He visits many Shamans and the mother starts having these strange dreams and is bothered by them.