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Pregnancy is divided into three trimesters, each lasting for approximately three months. [4] The exact length of each trimester can vary between sources. 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).
Postpartum period. The postpartum (or postnatal) period begins after childbirth and is typically considered to last for six weeks. [ 1] There are three distinct phases of the postnatal period; the acute phase, lasting for six to twelve hours after birth; the subacute phase, lasting six weeks; and the delayed phase, lasting up to six months.
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]
Postpartum confinement is a traditional practice following childbirth. [ 1] Those who follow these customs typically begin immediately after the birth, and the seclusion or special treatment lasts for a culturally variable length: typically for one month or 30 days, [ 2] 26 days, up to 40 days, two months, or 100 days.
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.
Embryonic development in the human, covers the first eight weeks of development; at the beginning of the ninth week the embryo is termed a fetus. The eight weeks have 23 stages. Human embryology is the study of this development during the first eight weeks after fertilization. The normal period of gestation (pregnancy) is about nine months or ...
Gestational age. In obstetrics, gestational age is a measure of the age of a pregnancy taken from the beginning of the woman's last menstrual period (LMP), [ 1] or the corresponding age of the gestation as estimated by a more accurate method, if available. Such methods include adding 14 days to a known duration since fertilization (as is ...
During the first 3 months of pregnancy, the main form of hemoglobin in the embryo/fetus is embryonic hemoglobin, which has 3 variants depending on the types of subunits it contains. The production of hemoglobin F starts from week 6, but it's only from 3 months onwards that it becomes the main type found in fetal red blood cells. [4]
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