If, as the story says, an 11-year old's body is not yet developed enough to handle gestation and birth, so it's curious why a girl often starts having her menstrual cycle at such a young age. It's not unusual for very young girls in third world countries to become pregnant and give birth to healthy babies. But I'm not a scientist, so what do I know.
I do know that females began maturing at a much younger age about two generations ago, along about the time when the vitamin rage began which I've always suspected had something to do with it. All three of my nieces had fully developed breasts by the age of 13, while in my generation at 13 we had little more than what looked like pimples showing through our undershirts! I had two sons, so I don't know which gene pool my sister's girls inherited, if any.