Funny Joke

A little girl was asking her teacher.
Girl: “Can my mom get pregnant?”
Teacher: “How old is your mom?”
Girl: “She’s 40!”
Teacher: Yes, she can.”
Girl: “Can my sister get pregnant?”
Teacher: “How old is your sister?”
Girl: “She’s 18.”
Teacher: “Yes, she can.”
Girl: “Can I get pregnant?
Teacher: “How old are you?”
Girl: “I’m 12.”
Teacher: “No you cannot get pregnant.”
A lil boy sitting behind the lil girl said, “I told you we have nothing to worry about.”
The teacher fainted.