One day he is 3 years old and you sign him up for gymnastics. As he runs around with the other kids the other parents and teachers begin to shout out "Hey! Look at that kid! Look how he runs around on the tips of his toes! Wow! He must have super strong calves!" And then as all the other kids are climbing up and over things, your son won't even climb a ladder because he is terrified.
We took him to the pediatrician who threw out wild ideas like Spinal bifada and MDS. She had him tested, but he was fine, so she referred us to a physical and occupational therapist.
At this point he was 3, and he was diagnosed with something called Sensory Integration Disorder.