Sounds a bit like "developmental dyspraxia"... which was an older term for Developmental Coordination Disorder (DCD) (developmental coordination disorder).
And Developmental Coordination Disorder (DCD)... can affect just a single aspect - a kid can be a fantastic athlete, but have major problems with writing, for example.
And writing is one of the most challenging tasks we learn.
www.canchild.ca has a whole section on Developmental Coordination Disorder (DCD) (not on the top menu, I think its to the left on the main page, haven't been there lately - if you don't see it, I'll go look it up).
