Biparietal diameter and femoral length standard at 29 weeks of pregnancy

During pregnancy, you need to do prenatal checkups every once in a while, and B-ultrasound examinations are also necessary. During the B-ultrasound, the doctor will get some data such as the baby's biparietal diameter and femoral length, but expectant mothers do not know what these data of the baby are considered normal. What are the standards for biparietal diameter and femur length of a fetus at 29 weeks of pregnancy?

1. Femoral head standard of the fetus at 29 weeks of pregnancy

The standard value of femur length is usually calculated starting from the 13th week of pregnancy, because the early pregnancy (1-12 weeks of pregnancy) is the whole process from the combination of sperm and egg to the initial embryo implantation to the basic growth and development of the various organs of the fetus, and only then will the various internal organs become complete. By the 29th week of pregnancy, the normal femoral length of the baby is generally between 52mm and 62mm. And with the increase of pregnancy weeks, the standard value of fetal femur length will gradually increase, because the body length and weight of the fetus will gradually increase.

However, due to the large amount of movement of the fetus in the mother's belly, the different postures of the fetus, and the operations of different doctors, there will be deviations in the data, and sometimes even large fluctuations, so it's okay for the standard values ​​to be slightly different. Experts say that after 30 weeks of pregnancy, there is a tolerance of up or down two weeks, so when expectant mothers see that the reported results are different from the standard values, they don't need to be overly anxious. If there is indeed a problem after the follow-up consultation, see a doctor for consultation and find a solution.

2. What are the factors that affect the fetal femur length?

1. Data error. The differences in fetal posture and the operations of different doctors will cause deviations in the fetal femoral length data.

2. The fetus is underdeveloped. Fetal maldevelopment can also affect the length of the fetus's femur. Pregnant women should monitor the health of their babies and themselves. If they have irregular abdominal pain, spotting during pregnancy, etc., they should go to the hospital for examination in time.

3. Genetic factors. The genetic factors of the fetus will also affect the length of the fetus's femur. For example, some fetuses have congenitally long femoral heads due to genetic factors, which in turn affects the baby's growth.

4. Lack of calcium. Calcium deficiency during pregnancy may affect the length of the fetus' femur. Appropriately supplement high-quality protein and high-quality protein, eat more foods containing high-quality protein in the diet, such as milk, lean pork, big bone soup, etc. In addition, pregnant women should get more sun exposure, which is beneficial to the digestion and absorption of calcium.

When a woman is pregnant, the most important thing she may be concerned about is whether the baby in her belly is growing healthily. When the pregnancy reaches 29 weeks, the normal length of the baby's femur will be more than 5 cm. This is a relatively normal data, but it is not 100%. If the expectant mother is pregnant with twins, it is also possible that the baby will be smaller.