#probably somewhere else too

[residents-of-the-darkforest]

Rook might have cerebral palsy from the lack of oxygen.

Some symptoms he might have include delays in developmental milestones, uncontrolled movements, muscle spasms, emotional imbalances, issues with sensation, etc.

Fun fact! this is also the condition of someone on a show I watch, 9-1-1. A good episode about it is I think Fools, which in one storyline details a kid dealing with it.