Many women like to record the number of days of pregnancy during pregnancy, making it convenient to keep track of the baby's gradual changes in the belly and to record when the baby can come out of the belly to meet the parents. Some pregnant women also choose to use ultrasound to check the duration of pregnancy. Have you ever encountered a situation where the duration of pregnancy does not match the duration of ultrasound? What's going on here?
The budget for the due date is the date on the first day of your last menstrual period. Subtracting 3 months or adding 9 months, adding 7 days in the Gregorian calendar, and adding 14 days in the lunar calendar gives you the due date. For example, the last menstrual period was on September 3, 2009, and the due date was June 10, 2010. Ultrasound shows that the fetus is younger than the actual number of days, but as long as the fetal development is normal, it is sufficient. Generally, the fetus develops rapidly in the first 3 months of pregnancy, during which regular prenatal check ups are necessary to prepare for childbirth. The actual delivery date can differ from the expected due date by about a week. But depending on one's own situation, there are also those who advance or retreat by half a month.
In clinical practice, when it is difficult to accurately estimate the due date due to factors such as menstrual cycle and inaccurate memory of the last menstrual period, we use ultrasound to monitor fetal size and estimate age and due date, which is a commonly used method. Your B-ultrasound suggests that the fetal size is half a month smaller than the actual gestational age. There are several possibilities, including longer menstrual cycle, inaccurate last menstrual period, fetal malnutrition, and placental and uterine reasons. Weight is only one of the indicators for measurement and does not have diagnostic significance. It grows quickly. The reason is the accumulation of maternal fat, edema, and polyhydramnios. In mid pregnancy, weight gain is generally more significant, which is normal. You can check the ultrasound again in a month. If it still doesn't match the gestational age, estimate the due date according to the ultrasound prompt, which will not affect the baby.
The above is the encyclopedia introduction about the discrepancy between pregnancy days and ultrasound days. In short, the due date and the gestational age of the child are calculated based on the last menstrual period! Due to personal nutritional reasons, many pregnant fetuses are of different sizes and gestational weeks, some are too big and some are too small. As long as the baby is normal, it's fine!
