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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 40 weeks. The germinal stage refers to the time from fertilization through the development of the early embryo until implantation is completed in the uterus.
Tooth buds, which will form the baby teeth, appear. The limbs are long and thin. The fetus can make a fist with its fingers. Genitals appear well differentiated. Red blood cells are produced in the liver. Heartbeat can be detected by ultrasound. [7]
The book consists of photographs charting the development of the human embryo and fetus from conception to birth; it is reportedly the best-selling illustrated book ever published. [1] Nilsson's photographs are accompanied by text, written by doctors, describing prenatal development and offering advice on antenatal care. [2]
There is no sharp limit of development, age, or weight at which a fetus automatically becomes viable. [21] According to data from 2003 to 2005, survival rates are 20–35% for babies born at 23 weeks of gestation (5 + 3 ⁄ 4 months); 50–70% at 24–25 weeks (6 – 6 + 1 ⁄ 4 months); and >90% at 26–27 weeks (6 + 1 ⁄ 2 – 6 + 3 ⁄ 4 ...
This activity assists with proper joint development. [15] Women who have already given birth have more relaxed uterine muscles that are consequently more sensitive to fetal motion, and for them fetal motion can sometimes be felt as early as 14 weeks. [18] By about week 21, the fetus begins to develop a regular schedule of movement. [17]
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The site also features a Pregnancy Planner, with fetal development photos, a customized newsletter and pregnancy info synchronized to a mother's due date; a baby namer tool, with thousands of name descriptions; a fertility calculator, buying guides, blogs, along with resources for health and safety, and child development.
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