I can move up to pre teen for you...

So the mom is getting ready to get in the shower and her 8 year old daughter asks:
"Mom can I take a shower with you?"
"Yes but dont look up and dont look down."
So the 8 year old daughter gets in and looks up.
"What are those?"
"Those are boobies."
"When am I gonna get those?"
"When you're older."
The little girl then looks down.
"What's all that hair mommy?"
"Thats pussy hair."
"When am I gonna get that?"
"When you're older."
So they get out of the shower and the father gets home from work. He jumps into the shower and the little girl comes up and ask to get in with him, he says yea and tells her not to look down. Of course she looks down.
"Daddy what's that?"
"It's a penis."
"When am I gonna get that?"
"In about ten minutes when your mom leaves."

Commence laughter...