From a specifically female point of view, marriage and childbirth were an important aspect in the life of a medieval girl or woman. The risks associated with childbirth, however, were quite high at the time due to a number of factors: age; health and illness; birthing complications; and death.
For many noble-born or royal women, marriage could and often did take place at a young age. There are many instances or very young girls being betrothed and married under the age of 10 years old. This did not necessarily mean that the marriage was consummated. However, there was a perception that once a girl began her period that she was considered to be of marriageable age. And so the male could begin his almighty pursuit for an heir.