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The second trimester is defined as starting, between the beginning of week 13 (12 weeks +0 days of GA) [4] and beginning of week 15 (14 weeks + 0 days of GA). [36] It ends at the end of week 27 (26 weeks + 6 days of GA) [ 36 ] or end of week 28 (27 weeks + 6 days of GA).
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] Birth normally occurs at a gestational age of about 40 weeks, though it is common for births to occur from 37 to 42 weeks. [ 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]
The universities start the second semester in the beginning of February. Both universities and colleges have the 'Easter break', which again is used to study for the examinations in June. After Easter, the classes start again until the end of May, followed by four weeks of examinations in June, after which three months of vacation is given.
The final stage is the fetal stage which begins at the ninth week of pregnancy and lasts until birth. Another way to measure pregnancy is by trimesters. The first trimester is from conception to 12 weeks of pregnancy, the second trimester is from 13 to 28 weeks of pregnancy, and the third trimester is from 29 weeks until birth.
At 14 weeks of gestation, the parathyroid glands begin to enlarge from 0.1 mm in diameter to approximately 1 – 2 mm at birth. [9] The developing parathyroid glands are physiologically functional beginning in the second trimester. [citation needed]
"Most babies with this condition end in a miscarriage before the second trimester," she says. "Those who survive the first trimester, do not live past 24 weeks gestation." But at 34 weeks pregnant ...
Fetal movements at the end of first trimester (early fetal stage) detected by 3D ultrasound. The parts of the fetal brain that control movement will not fully form until late in the second trimester, and the first part of the third trimester. [7]
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