Ben has passed out once before, but it was because he fell over and, I think, winded himself. We took him to A&E but only because he was really drowsy afterwards (wouldn't stay awake) and wobbley on his feet. after about 20 minutes he was back to normal and after a rather long wait, was sent to see the gp situated in the hospital. We were given the all clear and was told that it is fairly common for children to pass out. For Ben's particular situation, we were told they children (of all ages) often pass out if they have hurt themselves or they see blood. It's nothing to worry about and they will grow out of it. We were also told, not to worry, probably wouldn't happen again, but if it did to take him to our dr. Apparently DF's brother used to always pass out at the drop of a hat! as soon as he fell over or something he would just pass out. So I think It's a fairly common thing in children.
I wouldn't worry too much for one time passing out but if it happens again then a quick trip to the Dr's, just to see what they say

. but I wouldn't think it's anything too worry about, seems like it's quite a common thing in children.