I think it's called "development lag" in children, and there were a few studies done on how most eventually catch up to their peers. There are some contributing

I think it's called "development lag" in children, and there were a few studies done on how most eventually catch up to their peers. There are some contributing factors such as right/left hand dominance, vision and/or balance issues (many children go undiagnosed for a few years when suffering from issues with their eyes or inner ear etc), some hand-eye coordination lag can be attributed to a slowly developing brain / neurons, possibly down to nutrition, physical exercise, stimuli etc etc. While I agree that some children and adults seem to have an "innate" ability, I would argue this ability is formed by their development as children and how they grow up, and there are a few studies coming to this conclusion (just search "children development lag" on google scholar). I would further argue that most, if not all individuals barring physical and/or mental disabilities can acquire any given skill with deliberate practice (in a method that works best for them) over a certain period of time not far off those with an inherit advantage; again you can search "deliberate practice" on google scholar to find numerous studies.