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Illustration of fundal height at various points during pregnancy. 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.
The brain continues to develop. Arms and legs have lengthened with foot and hand areas distinguishable. The hands and feet have digits, but may still be webbed. The gonadal ridge begins to be perceptible. The lymphatic system begins to develop. Main development of sex organs starts.
A more recent trend in the United Kingdom has been the replacement of the kick chart with jewelry-based counters. A pregnancy bracelet is a wearable form of kick counter. The bracelets available work on similar principles: the baby kicks, the mother moves a marker. The idea is that this is more practical than using a pen and paper.
In human pregnancy, prenatal development is also called antenatal development. The development of the human embryo follows fertilization , and continues as fetal development . By the end of the tenth week of gestational age , the embryo has acquired its basic form and is referred to as a fetus .
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 36 weeks. The germinal stage refers to the time from fertilization through the development of the early embryo until implantation is completed in the uterus.
According to a study conducted by Whitcome, et al., lumbar lordosis can increase from an angle of 32 degrees at 0% fetal mass (i.e. non-pregnant women or very early in pregnancy) to 50 degrees at 100% fetal mass (very late in pregnancy). Postpartum, the angle of the lordosis declines and can reach the angle prior to pregnancy.
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Crystal Methamphetamine is an example of a recreational drug that can have serious negative consequences on fetal memory development if used during pregnancy. Similarly to nutritional intake, drugs consumed by the mother during pregnancy can affect the brain development of her fetus.