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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 fetus makes active movements. Sucking motions are made with the mouth.
The most accurate measurement for dating is the crown-rump length of the fetus, which can be done between 7 and 13 weeks of gestation. After 13 weeks of gestation, the fetal age may be estimated using the biparietal diameter (the transverse diameter of the head, across the two parietal bones), the head circumference, the length of the femur ...
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.
Trimester (pregnancy) in humans, where the time of pregnancy is divided into three terms of 13 weeks to refer to the fetus's development; A period of three months (Latin tri +mensis=month or moon) In Europe, where financial years start on 1 January each year, often Jan+Feb+Mar etc.
Counting by fertilization age, the length is about 38 weeks. [5] [13] Pregnancy is "the presence of an implanted human embryo or fetus in the uterus"; implantation occurs on average 8–9 days after fertilization. [15]
At 5 weeks, the embryo is a mass of cells with a developing neural tube (pre-spinal cord and brain). The forming fetus is no larger than a grain of rice.” Pregnancy tissue after an abortion at 5 ...
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