各孕周胎儿大小（Fetal size at each gestational week）.docVIP

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各孕周胎儿大小（Fetal size at each gestational week）.doc

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各孕周胎儿大小（Fetal size at each gestational week）

各孕周胎儿大小（Fetal size at each gestational week） 4 weeks gestation: the fetus is only 0.2 cm. When the fertilized egg has just completed its implantation, the amniotic cavity is formed and the volume is small. Ultrasound also fails to see signs of pregnancy. The brain and spinal cord begin to form, and the stomach and intestines are forming. 5 weeks gestation: the fetus grows to 0.4 cm, enters the embryo phase, the amnion cavity expands, primitive cardiovascular appearance, may have the pulsation. B ultrasound can see small fetal sac, fetal sac about 1/4 of the uterine cavity, or fetal bud. 6 weeks pregnant: the fetus grows to 0.85 cm, fetal head, brain bubble, frontal organs, respiratory, digestive, nervous and other organ differentiation, B-mode ultrasound sac clearly visible, and fetal bud and fetal heart beat. The embryonic heart has jumped to 150 times per minute at this time, two times the adult heart rate. 7 weeks of gestation: the fetus is 1.33 cm long, the embryo has a human embryo, the body segment has been fully differentiated, limb separation, the system further development. B ultrasound clearly shows the fetal bud and fetal heart beat, and the fetal sac occupies about l/3 of the uterine cavity. The appendix and pancreas have been developed, and the pancreas eventually secretes insulin to aid digestion. The liver is busy making red blood cells, and one segment of the intestine has begun to break into the umbilical cord. The umbilical cord now has clear blood vessels and begins to transport oxygen and nutrients back into the fetal body. 8 weeks of gestation: the fetus is 1.66 cm long, the shape of the fetus has been fixed, the fetal head, body and limbs can be separated, and the head of the fetus is larger than the trunk. Visible B ultrasound fetal bursa about bureaucratic 1/2, fetal morphology and movement clearly visible, and can see the yolk sac. Now, all the complex organs of the embryo begin to grow. 9 weeks gestation: the fetus grows to 2.15 cm, the fet