In the third trimester of pregnancy, many people will be very concerned about the fetal weight on the B-ultrasound list, because it is directly related to their delivery method, but I think there will be many people who say that the formulas I wrote are inaccurate, etc. It's just a reference, everything is still based on the baby's weight after birth.
2-40 Fetal Development Index Table
Note:
The data in this table is for reference only, please follow the doctor's advice!
Pregnancy fetal weight calculation formula:
- Formula 1: ( double parietal diameter )
fetal weight (g) = double parietal diameter (cm) × 900-5200
- formula 2: (abdominal circumference)
fetal weight (g)=- 2686.6+171.48×abdominal circumference (cm)
- Formula 3: (head circumference)
fetal weight (g) = -4973.72+260.69 × head circumference (cm)
- Formula 4: ( femur length )
fetal weight (g) =-2232.56+747.42×femoral length (cm)
Note:
This formula is suitable for babies over 30 weeks, only for estimation of fetal weight, you can calculate according to your baby's B super value!
The reason for the inaccurate weight of the baby estimated by the B-ultrasound:
1, the influence of the fetal position and posture develops , but the baby's body position and posture in the mother's belly are different, so the difference in body position and posture will also affect the test results.
2, B-ultrasound is difficult to accurately predict
B-ultrasound is unable to measure the baby's soft tissue such as muscle and fat , so it is difficult to predict accurately.
is like an adult with the same height and . It may be due to the difference in body fat rate that the body size seen is the same as difference .
3, Differences between Chinese and Western data
Most of the hospitals’ B-ultrasound equipment is imported equipment, so their equipment may also be based on foreigners’ data, but the dietary structure of residents in each country is different, which will also cause height Weight will vary.
It is understandable because of the difference in the weight of the baby after birth. As long as the difference between the baby's weight after birth and the weight calculated in the B-ultrasound is about ±400g, it is normal.
How does a pregnant mother control the fetus from being too large?
1、适当控制体重，合理饮食，少量多餐
孕前BMI | 体型 | 孕期体重总量/kg |
＜18.5 | 消瘦 | 12.5-18kg |
18.5-24 | 正常 | 11.5-16kg |
24-27.9 | 超重 | 7.5- 11.5kg |
≥28 | Obesity | 6.0-6.8kg |
2, choose appropriate exercise, yoga, walking, etc. are good choices
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-