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Gestational age: 7 weeks and 0 days until 7 weeks and 6 days old. 50–56 days from last menstruation. Embryonic age: Week nr 6. 5 weeks old. 36–42 days from fertilization. The embryo measures 13 mm ( 1⁄2 in) in length. Lungs begin to form. The brain continues to develop.
Human embryonic development or human embryogenesis is the development and formation of the human embryo. It is characterised by the processes of cell division and cellular differentiation of the embryo that occurs during the early stages of development. In biological terms, the development of the human body entails growth from a one-celled ...
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. The next period is that of fetal development where ...
The germinal stage is over at about 10 days of gestation. [2] The zygote contains a full complement of genetic material with all the biological characteristics of a single human being, and develops into the embryo. Embryonic development has four stages: the morula stage, the blastula stage, the gastrula stage, and the neurula stage.
Newborns typically lose 7–10% of their birth weight in the first few days, but they usually regain it within two weeks. [ 17 ] During the first month, infants grow about 1 to 1.5 inches (2.5 to 3.8 cm) and gain weight at a rate of about 1 ounce (28 g) per day.
Day 20 Fetal stage begins 10 weeks, 1 day [32] 8 weeks, 1 day [32] 7 weeks, 2 days First trimester ends 13 weeks 11 weeks 10 weeks Second trimester ends 26 weeks 24 weeks 23 weeks Childbirth: 39–40 weeks 37–38 weeks [33]: 108 36–37 weeks
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Child development. Child development involves the biological, psychological and emotional changes that occur in human beings between birth and the conclusion of adolescence . Childhood is divided into three stages of life which include early childhood, middle childhood, and late childhood (preadolescence). [ 1]