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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. The germinal stage takes around 10 days. [1] During this stage, the zygote divides in a process called cleavage.
Gestational age: 12 weeks and 0 days until 15 weeks and 6 days old. Embryonic age: 10 weeks and 0 days until 13 weeks and 6 days old. The fetus reaches a length of about 15 cm (6 in). A fine hair called lanugo develops on the head. Fetal skin is almost transparent. More muscle tissue and bones have developed, and the bones become harder.
The first ten weeks of gestational age is the period of embryogenesis and together with the first three weeks of prenatal development make up the first trimester of pregnancy. From the 10th week of gestation (8th week of development), the developing embryo is called a fetus.
It ends at the end of week 27 (26 weeks + 6 days of GA) [37] or end of week 28 (27 weeks + 6 days of GA). [4] The third trimester is defined as starting, between the beginning of week 28 (27 weeks + 0 days of GA) [37] or beginning of week 29 (28 weeks + 0 days of GA). [4] It lasts until childbirth.
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 months) and over. [22] It is rare for a baby weighing less than 500 g (1 lb 2 oz) to survive. [21]
The book proceeds along two "tracks": one series of photographs and accompanying text depict the development of the fetus from conception through to birth; the other shows a woman and her partner as her pregnancy progresses. Early images show sperm proceeding toward an ovum; cell division, implantation, and the development of the embryo are ...
The postpartum period can be divided into three distinct stages; the initial or acute phase, six to 12 hours after childbirth; subacute postpartum period, which lasts two to six weeks, and the delayed postpartum period, which can last up to six months. In the subacute postpartum period, 87% to 94% of women report at least one health problem.
Early childhood development is the period of rapid physical, psychological and social growth and change that begins before birth and extends into early childhood. [1] While early childhood is not well defined, one source asserts that the early years begin in utero and last until 3 years of age. [1]