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In comparison to the embryo, the fetus has more recognizable external features and a more complete set of developing organs. 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 40 weeks.
A woman pregnant for the first time (nulliparous) typically feels fetal movements at about 21 weeks, whereas a woman who has given birth before will typically feel movements by 20 weeks. [13] By the end of the fifth month, the fetus is about 20 cm (8 in) long.
Pregnancy may be confirmed with a pregnancy test. [ 7 ] Methods of birth control —or, more accurately, contraception —are used to avoid pregnancy. Pregnancy is divided into three trimesters of approximately three months each. The first trimester includes conception, which is when the sperm fertilizes the egg.
However, the actual duration between last menstruation and fertilization may in fact differ from the standard 2 weeks by several days. Thus, the first week of embryonic age is already week three counting with gestational age. Furthermore, the number of the week is one more than the actual age of the embryo/fetus.
Prenatal development (from Latin natalis 'relating to birth') involves the development of the embryo and of the fetus during a viviparous animal 's gestation. Prenatal development starts with fertilization, in the germinal stage of embryonic development, and continues in fetal development until birth. In human pregnancy, prenatal development is ...
Signs and symptoms of pregnancy are common, benign conditions that result from the changes to the body that occur during pregnancy. Signs and symptoms of pregnancy typically change as pregnancy progresses, although several symptoms may be present throughout.
Fundal height, or McDonald's rule, is a measure of the size of the uterus used to assess fetal growth and development during pregnancy. It is measured from the top of the mother's uterus to the top of the mother's pubic symphysis. Fundal height, when expressed in centimeters, roughly corresponds to gestational age in weeks between 16 and 36 ...
Brittany Mahomes is taking a trip down memory lane. On Monday, Sept. 30, the Kansas City Current co-owner, 29, — who is currently pregnant with a baby girl — shared two adorable snaps on her ...
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