经期提前
经期提前-
根据美国儿科学会的数据，女孩们的青春期出现的时间提前，八岁开始出现性状，经期也提前，19世纪末，经期来临的时间大约是15岁，而现在年龄降低到了12岁。
According to the American Academy of Pediatrics , girls are hitting puberty earlier , showing signs as early as 8 years of age , and also getting their periods earlier , down from an age of almost 15 in the late 1800s to today 's average of about 12 .