Prenatal development and sonograph images
Prenatal development is divided into two primary biological stages. The first is the embryonic stage, which lasts for about two months. At this point, the fetal stage begins. At the beginning of the fetal stage, the risk of miscarriage decreases sharply, all major structures including hands, feet, head, brain, and other organs are present, and they continue to grow and develop. When the fetal stage commences, a fetus is typically about 30 mm (1.2 inches) in length, and the heart can be seen beating via sonograph; the fetus bends the head, and also makes general movements and startles that involve the whole body. Brain stem activity has been detected as early as 54 days after conception, and the first measurable signs of EEG activity occur in the 12th week. Some fingerprint formation occurs from the beginning of the fetal stage.
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Information on this website has been sourced from Wikipedia contributors. Pregnancy. Wikipedia, The Free Encyclopedia. www.wikipedia.org