Early Menstruation Linked to Estrogen-Mimicking Chemical
Over the past century, the age of menarch—when a girl menstruates for the first time—has changed from an average of 16 to 17 years to the current 12 to 13…
Over the past century, the age of menarch—when a girl menstruates for the first time—has changed from an average of 16 to 17 years to the current 12 to 13…