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The estimated date of delivery (EDD), also known as expected date of confinement, [1] and estimated due date or simply due date, is a term describing the estimated delivery date for a pregnant woman. [2] Normal pregnancies last between 38 and 42 weeks. [3] Children are delivered on their expected due date about 4% of the time. [4]
In a first pregnancy it may happen a few weeks before the due date, though it may happen later or even not until labor begins, as is typical with subsequent pregnancies. [58] It is during the third trimester that maternal activity and sleep positions may affect fetal development due to restricted blood flow.
Third-trimester obstetric ultrasonography (head circumference, femur length) ±8% of the estimate As a general rule, the official gestational age should be based on the actual beginning of the last menstrual period, unless any of the above methods gives an estimated date that differs more than the variability for the method, in which case the ...
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 ]
Primitive heart tube is forming. Vasculature begins to develop in embryonic disc. (day 20 of fertilization. [1]) Embryo at 4 weeks after fertilization. [3] A 10mm embryo from an ectopic pregnancy, still in the oviduct. This embryo is about five weeks old (or from the seventh week of menstrual age).
An ultrasound showing an embryo measured to have a crown-rump length of 1.67 cm and estimated to have a gestational age of 8 weeks and 1 day. Crown-rump length (CRL) is the measurement of the length of human embryos and fetuses from the top of the head (crown) to the bottom of the buttocks (rump).
Signs and symptoms of pregnancy typically change as pregnancy progresses, although several symptoms may be present throughout. Depending on severity, common symptoms in pregnancy can develop into complications. [1] Pregnancy symptoms may be categorized based on trimester as well as region of the body affected.
Also starting about week 12, the thoracic diaphragm moves up and down as if the fetus were breathing, but this movement disappears about week 16 and does not resume until the third trimester. [16] Movements such as kicking continue, and the mother usually feels movement for the first time, an event called quickening, during the fifth month. [17]
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