My neighbours daughters aged 5 and 3 yrs were staying at mine the other afternoon as my neighbour asked me to mind them as she had a hospital appointment. Anyway I was changing my sons nappy and the 3 yr old said to me - boys have a penis and girls have a vagina, my mum showed me on daddy. His penis is bigger than Noah's( my son). I was really shocked that she said this, Aibu to think this shocking or is this normal?