A.S.
My son has bit through his bottom lip THREE times! Once in my presence, once in a sitter's presence [she was horrified and so apologetic] and at daycare/pre-K.
My son has hit his head countless times in presence of many and different places.
My son has given himself a few black eye's... Some in front of me, one at grandma's, and once or twice at daycare/pre-K.
Couldn't count how many other boo-boo's. Some with blood, some without. More often than not, he just brushes it off anymore and continues playing.
Happens all the time with mine. : )
No worries mama!
ETA- The school/daycare ALWAYS calls immediately... Well, so did the sitter when he bit his lip around her.