Ehlers Danlos Type 3 is hypotonia caused by too much collagen in the connective tissues. My dd was seen by a neurologist first and then dx'd with EDS Type 3 by a geneticist at a Children's Hospital at 6 mos.
She received physical therapy til she was 3 yo. Today, she's nearly 10 and still is the slowest runner in PE class and is just now able to pull everything together to swim. She has to be careful to not over extend or do high impact exercise like gymnastics. We do wall pushups and planks and ball exercises to strengthen her core. As a baby she was so flexible she scratched the top of her head with her toes and today she can still lie on her stomach and touch the back of her head with her foot. But we don't encourage it because it'll make her hip and ankle joints pop (not dislocate, but like when you crack your knuckles.)
She has no learning difficulties and is doing very well school wise.