I'd go in, assess his level of consciousness, do some neuro tests to check for focal deficits.
Under what authority are you making contact with the batter? The coach isn't requesting your assistance yet. What neuro tests do you do, when, and why?
ask him if he's having a hard time breathing, check the pulse, check his breathing (could be signs of a head injury (aka cushing triad)), like say he's a kid, and hes braddin along at a rate of 40, breathing at 10 a min, and his pressure is 190/110, not normal vits for a kid...
I doubt you'd see that severe of a head injury in a Little League player absent some congenital defect.
however, being new to this site, i live in canada, and work as an EMT in a metro service, many of our patients are fine... actually a LOT of our patients are fine, and just request to go to the hospital (for their sore knee from the fall they had 8 days ago :glare
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the fact that it was a baseball is a pretty low mechanism of injury, hitting the hard helmet may have just gave him a slight concussion, probably stunning him as he's never felt that before.
A baseball, pitched at someone's head, at 90+ MPH will do more than a minor concussion if the impact is in the right area. How confident are you in evaluating concussions? The fact that this is Little League means that chances are the kid may not even have a concussion, but is just surprised that he got hit in the head. Of course, some of the older Little Leaguers can develop some serious fastball speeds.
but if it was serious, rapid transport, IV, o2, monitor, basic EMT skills that should be done on every unwell patient.
yup, BLS seems like an intimidating job, but its the easiest thing you can imagine.
LOC - ABC's - Bleeding (stop bleeding!) - other injuries or signs of illness?(aka assessment) - treat based on your protocols.