Oh really, My brother is 7 and i watched him grow up and do all this before i had my son, So he is fine and we didn't yank it or anything, just starting cleaning under it and pulling it little bit at a time by the age of about 2.
We let him be curious with it, and trust me, He shoves toys and teddys down his pants, very odd.... hehehe
But what should i do? Its been years of us doing this.
Sorry TMI. I know i went out with a guys years ago and he never pulled the foreskin back when growing up, just let nature take its course and it never did, it grew like that, it looked odd and he never could use it properly, IYKWIM. So i would be careful when deciding when?