A fertilized egg develops into a baby inside the uterus. Most of the time, however, an egg is not ...
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A fertilized egg develops into a baby inside the uterus. Most of the time, however, an egg is not fertilized. Blood and tissue that have built up inside the uterus in preparation for pregnancy are shed through menstruation. This cycle is repeated for each menstrual cycle. Although menstruation occurs on average every 28 days, there is wide variation in the timing and duration of normal menstrual cycles. Many women find that the flow becomes lighter as they get older, which reflects reduced build up of blood and tissue inside the uterus with increasing age.
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