Fetal weight at 24 weeks of pregnancy

The weight of the fetus at 24 weeks of pregnancy can be measured by calculating the bidiameter, and you can also observe the development of your baby at all times. If the cephalopelvis and pelvis are too small, it will cause some difficulties during delivery and will also cause the fetus to be smaller overall. Especially in the middle and late stages of pregnancy, you should pay special attention to their weight so that the fetus's physical development can become better.

Biparietal diameter (BPD), a medical term, also known as the biparietal diameter of the fetal head, refers to the length of the widest part between the left and right sides of the fetal head, also known as the "great transverse diameter of the head." Ultrasound measurement of BPD>8.5 indicates fetal maturity.

Doctors often use it to observe the child's development and determine whether there is cephalopelvic disproportion and a smooth delivery. It should reach 9.3 cm or more at full term. According to general rules, after 5 months of pregnancy, the BPD is basically consistent with the month of pregnancy, that is, at 28 weeks of pregnancy (7 months) the BPD is about 7.0 cm, at 32 weeks of pregnancy (8 months) it is about 8.0 cm, and so on. After 8 months of pregnancy, an average weekly growth of about 0.2 cm is normal. When the due date cannot be determined by CRL in the early stage, BPD is often used to predict it; after the middle stage, this data is often also needed to be measured when estimating the fetal weight.

4 weeks: The embryo is only 0.2 cm. The amniotic cavity is formed just after the fertilized egg has implanted and its volume is very small. Ultrasound cannot show clear signs of pregnancy.

5 weeks: The embryo grows to 0.4 cm and enters the embryonic period. The amniotic cavity expands and primitive cardiovascular system appears, which may pulsate. B-ultrasound can show a small gestational sac, which occupies less than 1/4 of the uterine cavity, or a fetal bud can be seen.

6 weeks: The embryo grows to 0.85 cm, the fetal head, brain alveoli, facial organs, respiratory, digestive, nervous and other organs are differentiated, the fetal sac is clearly visible on B-ultrasound, and the fetal bud and fetal heartbeat are seen.

7 weeks: The embryo grows to 1.33 cm. It has the rudiments of a human being, with all the body segments differentiated, the limbs separated, and all systems further developed. B-ultrasound clearly shows the embryo and fetal heartbeat, and the gestational sac occupies about 1/3 of the uterine cavity.

8 weeks: The embryo grows to 1.66 cm. The fetal shape is determined and the head, body and limbs can be distinguished. The head is larger than the trunk. B-ultrasound shows that the gestational sac occupies about 1/2 of the uterine cavity, the fetal shape and fetal movement are clearly visible, and the yolk sac can be seen.

9 weeks: The fetus grows to 2.15 cm, the head is larger than the body, the various parts are clearer, the skull begins to calcify, and the placenta begins to develop. B-ultrasound shows that the gestational sac almost fills the uterine cavity, the fetal outline is clearer, and the placenta begins to appear.

10 weeks: The fetus grows to 2.83 cm, all fetal organs have been formed, and the rudiments of the placenta are formed. B-ultrasound shows that the gestational sac begins to disappear, a crescent-shaped placenta is visible, and the fetus is active in the amniotic fluid.

11 weeks: The fetus grows to 3.62 cm, the fetal organs develop further, and the placenta develops. B-ultrasound showed that the gestational sac had completely disappeared and the placenta was clearly visible.