You can get pregnant again....

I dont know why but Nicole has been pestering me for a baby sister for the past couple of weeks.
Nic " mom, I want a baby sister"
Me " No, you won't have one. I am too old to have another baby"
Nic " No, you still can. You can get pregnant again. Look, here, in your tummy"
Me " No, no, I am very tired looking after both of you, as it is" (trying to end the dialog before she could tell me how to get pregnant,,,OMG!...I wasn't aware that she knew the word pregnant!)