The size of the developing fetus during pregnancy as determined by ultrasound is one of the more informative methods. Pregnant women will see some values on the examination report when they have an ultrasound, and these values are what tell you the size of the developing baby. The process of fetal development in early pregnancy and the pregnancy seen by ultrasound is a complex process. After the egg is fertilized and enters the uterine cavity, the embryo and its appendages grow and develop rapidly until maturity, and there are different changes in each pregnancy week. 4 weeks: The fetus is only 0.2 cm. The fertilized egg has just completed its implantation, the amniotic cavity has only formed and is very small. The ultrasound cannot yet see any signs of pregnancy. The fetus reaches 0.4 cm and enters the embryonic stage, the amniotic cavity is enlarged, the primitive cardiovascular vessels are present and may be pulsating, and a small fetal sac can be seen on ultrasound, occupying less than 1/4 of the uterine cavity, or a fetal bud may be visible. 6 weeks: the fetus grows to 0.85 cm, the fetal head, brain vesicles, frontal organs, whistling, digestive and neurological organs are differentiated, the fetal sac is clearly visible on ultrasound, and the fetal bud and fetal heartbeat can be seen. 7 weeks: The fetus is 1.33 cm long, the embryo is already in human form, all body segments are differentiated, the limbs are differentiated and all systems are further developed. 8 weeks: The fetus is 1.66 cm long, the fetal shape is fixed, the fetal head, body and limbs can be differentiated, the fetal head is larger than the trunk. the fetal sac is clearly visible on ultrasound, the fetal form and fetal movement are clearly visible. The yolk sac can be seen. The fetal head is larger than the fetal body, and all parts of the fetus are clearer, the head is calcified and the placenta is developing. 10 weeks: The fetus is 2.83 cm long, all the fetal organs are formed, the placenta is forming, the fetal sac is disappearing, the placenta is visible in the form of a moon bud, the fetus is active in the amniotic fluid. 11 weeks: The fetus is 3.62 cm long, all the fetal organs have developed further and the placenta is developing, the ultrasound shows that the fetal sac has completely disappeared and the placenta is clearly visible. 12 weeks: the fetus grows to 4.58 cm, the external genitalia are initially developed, if there are deformities can be shown, the cranial calcification is more perfect. The cranial halo is clear, the biparietal diameter can be measured, obvious malformations can be diagnosed, after that the organs tend to be perfect. The normal value of fetal development in mid-pregnancy ultrasound examination The size of fetal development during pregnancy through ultrasound is one of the more informative methods, pregnant women will see some values on the examination report when they do ultrasound, these values are telling you the size of the baby’s development. To read these numbers, you need to read the following article carefully. 13 weeks of pregnancy: the average value of the biparietal diameter is 2.52 s.0.25 The average value of the abdominal circumference is 6.90 s.l.65 The femoral length is 1.17 s.0.31. 14 weeks of pregnancy: the average value of the biparietal diameter is 2.83 s.0.57 The average value of the abdominal circumference is 7.77 s.1.82 The femoral length is 1.38 s.0.48. 15 weeks of pregnancy: the average value of the biparietal diameter is 3.23 s.0.51 The average value of the abdominal circumference is 9.13 s.1. At 16 weeks of gestation, the mean biparietal diameter was 3.62 and the mean abdominal circumference was 10.32 and 1.92, and the mean femoral length was 2.10 and 0.51. At 17 weeks of gestation, the mean biparietal diameter was 3.97 and 0.44, and the mean abdominal circumference was 11.49 and 1.62, and the mean femoral length was 2.52 and 0.44. 0.44. 18 weeks of gestation: the mean biparietal diameter was 4.25 and 0.53, the mean abdominal circumference was 12.41 and 1.89, and the mean femoral length was 2.71 and 0.46. 19 weeks of gestation: the mean biparietal diameter was 4.52 and 0.53, the mean abdominal circumference was 13.59 and 2.30, and the mean femoral length was 3.03 and 0.50. 20 weeks of gestation: the mean biparietal diameter was 4.88 and 0.58. The mean value of abdominal circumference was 14.80 l.89 and femur length was 3.35 o.47. 21 weeks of gestation: the mean value of biparietal diameter was 5.22 0.42 and the mean value of abdominal circumference was 15.62 1.84 and femur length was 3.64 0.40. 22 weeks of gestation: the mean value of biparietal diameter was 5.45 0.57 and the mean value of abdominal circumference was 16.70 2.23. At 23 weeks of gestation, the mean biparietal diameter was 5.80 and 0.44, and the mean abdominal circumference was 17.90 and 1.85, and the mean femoral length was 4.21 and 0.41. At 24 weeks of gestation, the mean biparietal diameter was 6.05 and 0.50, and the mean abdominal circumference was 18.74 and 2.23, and the mean femoral length was 4.36 and 0.51. At 25 weeks of gestation, the mean biparietal diameter was 6.39 and 0.70. At 26 weeks of gestation, the mean biparietal diameter was 6.68 s.0.61 and the mean abdominal circumference was 21.62 s.2.30. The mean femur length was 4.87 s.O.41. At 27 weeks of gestation, the mean biparietal diameter was 6.98 s.0.57 and the mean abdominal circumference was 21.81 s.O.12. 2.12 Femur length is 5.10s 0.41. 28 weeks of pregnancy: the average of biparietal diameter is 7.24s O.65, the average of abdominal circumference is 22.86s 2.41, the average of femur length is 5.35s 0.55. Mothers-to-be in late pregnancy must also want to know if your baby is developing normally, carefully compare it with your ultrasound results. 29 weeks of pregnancy: the average value of the biparietal diameter is 7.50s 0.65, the average value of the abdominal circumference is 23.71s 1.50, the average value of the femur length is 5.61s 0.44. 30 weeks of pregnancy: the average value of the biparietal diameter is 7.83s 0.62, the average value of the abdominal circumference is 24.88s 2.03, the average value of the femur length is 5.77s 0.47. 31 weeks of pregnancy: the average value of the biparietal diameter is 32 weeks of gestation: the mean value of biparietal diameter was 8.17 and the mean value of abdominal circumference was 26.20 and 2.33, and the mean value of femoral length was 6.43 and 0.49. 33 weeks of gestation: the mean value of biparietal diameter was 8.50 and 0.47, and the mean value of abdominal circumference was 27.78. The mean value of femoral length was 6.42 and 0.46. 34 weeks of gestation: the mean value of biparietal diameter was 8.61 and 0.63, the mean value of abdominal circumference was 27.99 and 2.55, and the mean value of femoral length was 6.62 and 0.43. 35 weeks of gestation: the mean value of biparietal diameter was 8.70 and 0.55, and the mean value of abdominal circumference was 28.74 and 2.88. At 36 weeks of gestation: the mean biparietal diameter was 8.81 and 0.57, the mean abdominal circumference was 29.44 and 2.83, and the mean femoral length was 6.95 and 0.47. At 37 weeks of gestation: the mean biparietal diameter was 9.00 and 0.63, the mean abdominal circumference was 30.14 and 2.17, and the mean femoral length was 7.10 and 0.52. At 38 weeks of gestation, the mean biparietal diameter was 9.08 and the mean abdominal circumference was 30.63 and 2.83, and the mean femoral length was 7.20 and 0.43. At 39 weeks of gestation, the mean biparietal diameter was 9.21 and 0.59, and the mean abdominal circumference was 31.34 and 3.12, and the mean femoral length was 7.34 and 0.53. At 40 weeks of gestation, the mean biparietal diameter was 9.00 and 0.63, and the mean abdominal circumference was 30.14 and 2.17, and the mean femoral length was 7.10 and 0.52. The mean biparietal diameter was 9.28 and 0.50 and the mean abdominal circumference was 31.49 and 2.79. The mean femoral length was 7.4 and 0.53.