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Late termination of pregnancy, also referred to politically as third trimester abortion, [2] describes the termination of pregnancy by inducing labor during a late stage of gestation. [3] In this context, late is not precisely defined, and different medical publications use varying gestational age thresholds. [ 3 ]
Human pregnancy can be divided into three trimesters, each approximately three months long: the first, second, and third trimester. The first trimester is from the last menstrual period through the 13th week, the second trimester is 14th–28/29th week, and the third trimester is 29/30th–42nd week. [6]
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]
Gestational age: 5 weeks and 0 days until 5 weeks and 6 days old. 36–42 days from last menstruation. Embryonic age: Week nr 4. 3 weeks old. 22–28 days from fertilization. The embryo measures 4 mm (1 ⁄ 8 in) in length and begins to curve into a C shape. The heart bulges, further develops, and begins to beat in a regular rhythm.
The first ten weeks of gestational age is the period of embryogenesis and together with the first three weeks of prenatal development make up the first trimester of pregnancy. From the 10th week of gestation (8th week of development), the developing embryo is called a fetus.
Let's say the first day of your last period was April 10 and you became pregnant thereafter; that would mean your baby was conceived around April 24, or during week three. Certain pregnancy tests ...
The first trimester begins with the start of gestational age as described above, that is, the beginning of week 1, or 0 weeks + 0 days of gestational age (GA). It ends at week 12 (11 weeks + 6 days of GA) [ 4 ] or end of week 14 (13 weeks + 6 days of GA).
1.1.3 Third trimester. ... for various complications of pregnancy. [3] ... and performed the first ovariotomy in 1809 on a 47-year-old widow who then lived ...