This has been going on a little while and the health visitor says its normal but we are a bit concerned about the force our child is using when he pulls at his penis: He really yanks it and it looks like it could do some damage...
Particularly when he stretches both as far as he can!
And the other day his nail cut him on his scrotum while I was changing him so I was even more concerned about bacteria.
How can I encourage him to stop doing it so forcefully without teaching him it's wrong to explore his body?