Is it normal for the baby to be one week larger according to the B-ultrasound? What is the reason for the baby to be smaller according to the B-ultrasound?

B-ultrasound is the most common test for pregnancy checkups. It can check the baby's head circumference and other growth and development data to determine the development of the fetus. So is it normal for the baby to be larger or smaller during B-ultrasound examination?

Is it normal for the baby to be one week older on ultrasound?

From a medical point of view, it is normal for the ultrasound results to show that the baby is one or two weeks bigger or smaller.

The prediction of the baby's growth weeks by B-ultrasound is based on the biparietal diameter, femur length and other values, and then calculated using a formula. This result is more dependent on several values ​​and empirical formulas. For babies with normal growth and development, the value obtained is more accurate, but for some special babies, it is a little less accurate.

For example, if the baby is tall but has a small head, if the above values ​​are used for calculation, the femur length will be large, so the gestational age will be larger; if the baby is shorter, the femur length will be smaller, so if other values ​​remain unchanged, the gestational age will be smaller. Although the baby's growth and development are fine, the B-ultrasound results show that the baby is one or two weeks older or younger.

This two-week difference is medically acceptable.

Of course, if it exceeds 2 weeks, you need to check in time to see whether the baby is developing too well or too poorly, otherwise it will affect the baby's healthy growth.

Why is the baby small in B-ultrasound examination?

If your menstrual cycle is not normal, the size of the fetus checked by B-ultrasound may be related to delayed ovulation and late conception, or the data from B-ultrasound may be inaccurate. In addition, the diet should also be supplemented with nutrition as much as possible, and the growth and development of the fetus can be checked every 3 weeks. It is best to see the growth and development of the fetus.

If the B-ultrasound examination in early pregnancy is consistent with the gestational age, it is believed that the current low age is caused by malnutrition. It may also be that the baby absorbs nutrition poorly. At this time, you can add more protein-rich foods and some milk powder for pregnant women, which will help the baby's growth and development.

If the umbilical cord blood flow determined by B-ultrasound is within the normal range, hypertension during pregnancy can be ruled out. Fetal development can be promoted through dietary adjustments, and nutrient solution can be intravenously infused in the hospital if necessary.

Will a large fetus be born early?

A large fetus does not have much impact on when the baby is born. On the contrary, a large fetus may make natural delivery difficult. Generally speaking, a large fetus may cause dystocia, and episiotomy or caesarean section may be required. The specific details will not be known until the day of delivery.

The size of the fetus observed by B-ultrasound is only a growth condition of the fetus in the uterus. It cannot determine whether the fetus will be born early or late. Whether the fetus is mature and whether it will be born does not depend on the size of the fetus but on some physiological conditions of the fetus itself and the pregnant woman. The most commonly used indicator is the cervical index.