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The average age of a girl's first period is 12 to 13 (12.5 years in the United States, [6] 12.72 in Canada, [7] 12.9 in the UK [8]) but, in postmenarchal girls, about 80% of the cycles are anovulatory in the first year after menarche, which declines to 50% in the third year, and to 10% by the sixth. [9]
During Tanner V, females stop growing and reach their adult height. Usually, this happens in their mid teens at 14 or 15 years for females. Males also stop growing and reach their adult height during Tanner V; usually this happens in their late teens at 16 to 17 years, [medical citation needed] but can be a lot later, even into the early 20s.
Teenage pregnancy, also known as adolescent pregnancy, is pregnancy in a female under the age of 20. [5] Worldwide, pregnancy complications are the leading cause of death for women and girls 15 to 19 years old. [3] The definition of teenage pregnancy includes those who are legally considered adults in their country. [2]
In the United States, the level was 4 times as high, with 84 per 1,000 teenage girls pregnant. The likelihood of pregnant teenage girls having abortions across the four countries differ and exclude miscarriages. In the U.S. abortion rates for 15–19 years are 35%, compared to 69% in Sweden, 39% in Great Britain, 46% in Canada, and 51% in ...
The mean pregnancy length has been estimated to be 283.4 days of gestational age as timed from the first day of the last menstrual period and 280.6 days when retrospectively estimated by obstetric ultrasound measurement of the fetal biparietal diameter (BPD) in the second trimester. [12]
In the US, the average age at which women bore their first child advanced from 21.4 years old in 1970 [11] to 26.9 in 2018. [4]The German Federal Institute for Population Research claimed in 2015 the percentage for women with an age of at least 35 giving birth to a child was 25.9%.
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A "primigravida" is a female who is pregnant for the first time or has been pregnant once. A " multigravida " or " secundigravida " is a female who has been pregnant more than once. Terms such as "gravida 0", referring to a nulligravida, "gravida 1" for a primigravida, and so on, can also be used.