Will a boy be born earlier than the expected date? There are two reasons why boys are born earlier than girls.

Boys will be born before the due date, while girls will be born a little later than the due date. This is not superstition, but has certain scientific basis. First, the fetal movement of boys is stronger, and second, the hormone levels of boys and girls are different.

Yes, for 2 reasons:

Reason 1: Fetal movement

Most boys are more naughty than girls, both after they are born and in their mother's womb. They like to interact with their mother through fetal movements, and their activity level is also greater than that of girls, so they may be born earlier than the expected date of delivery. Doctors have something to say: Although fetal movement is one of the reasons why boys are born earlier than girls, it is not completely correct to judge the gender of the baby in the belly based on this. The examination results should still be the main factor.

Reason 2: Different hormone levels in boys and girls

In addition, another important reason why boys are due earlier than girls is that the hormone levels in boys and girls are different. Medical studies have shown that their hormone secretions are different, which will cause boys to grow and develop faster than girls. Therefore, the gestation period will be shorter than that of girls, resulting in birth before the due date. Tips: Although boys are born earlier than girls, this is not the case for every pregnant mother. It is very likely that the due date will be advanced or delayed due to other external interference factors. Even if the birth is delayed, it will not cause any negative impact on the pregnant mother and the baby. It is recommended that pregnant women, in addition to paying attention to fetal movements, should also keep a happy mood and not be too nervous. At the same time, expectant mothers should go to the hospital regularly for check-ups and make preparations early.

1. Calculation method of the last menstrual period: add 9 or subtract 3 to the month of the last menstrual period, and add 7 to the day (the day refers to the first day of the last menstrual period).

For example: For example, the last menstrual period started on March 5th and ended on March 10th.

Then the due date is

Month = 3 + 9 = December

Date = 5 + 7 = 12th

So the due date is December 12th.

Applicable people: This method is suitable for pregnant mothers who can clearly remember their last menstruation and have a normal menstrual cycle (about 28 to 32 days). In fact, many due date calculators on the Internet or due date calculation books issued by hospitals use this calculation method.

2. B-ultrasound data calculation method: Through B-ultrasound examination, measuring the baby's biparietal diameter, head circumference, femur length, abdominal circumference and other physical data of the baby (which is similar to the three measurements of adults), the expected date of delivery can also be calculated.

The following are the relevant B-ultrasound data. It doesn't matter if pregnant mothers don't understand. Because the doctor will help you calculate the gestational age (the age of the fetus, calculated in weeks, generally the gestational age of the fetus is 40 weeks) based on these data, you don't need to calculate it yourself. Generally, after the calculation, the doctor will indicate on the B-ultrasound form: gestational age ** weeks + * days.

GS—gestational sac: also called gestational sac, it is a small house that wraps the baby and amniotic fluid. Generally, 35 days after menstruation stops, the gestational sac can be seen in the uterine cavity through B-ultrasound. The diameter of the gestational sac is about 2 cm at 6 weeks of pregnancy and about 5 cm at 10 weeks of pregnancy.

FE—Embryonic bud: When the baby is not yet formed, it is just like a small bean that has just sprouted. The embryonic bud can be seen by B-ultrasound at 6-7 weeks of pregnancy.

CRL—Crown-Rump Length: It is the distance between the baby’s head and buttocks, and is mainly used to determine the gestational age between 7 and 12 weeks. The estimated gestational age between 6 and 13 weeks (weeks) = crown-rump length + 6.5 (cm)

BDP—Biparietal diameter of the fetal head: the length of the widest part between the left and right sides of the fetal head. It should reach 9.3 cm or more at full term. According to general rules, after 5 months of pregnancy, it is basically consistent with the month of pregnancy, that is, BPD is about 7.0 cm at 28 weeks of pregnancy (7 months), about 8.0 cm at 32 weeks of pregnancy (8 months), and so on. After 8 months of pregnancy, an average weekly growth of about 0.2 cm is normal. (If you can't remember the time of menstruation. Or if the pregnant mother has a more irregular menstrual cycle, you can use B-ultrasound data to see how big the fetus is, so as to calculate the expected date of delivery)

FL—Femur length: refers to the length of the femur from the base of the thigh to the knee of the fetus. Generally, the development of the fetus is checked by measuring FL around the 20th week of pregnancy.

If the due date calculated by B-ultrasound is different from the calculated by menstruation, and the gestational age is one or two weeks too high or too low, there is no need to worry too much. Some data will change slowly. If it is too low, eat more to let the baby catch up. If it is too high, pay attention to controlling your diet and don't overeat. As long as it meets the menstrual cycle calculation method, you are ready to welcome the baby at 37 weeks, so there is no need to worry about the problem that the B-ultrasound due date does not match the actual due date.

Not necessarily. The due date, as the name implies, is the expected date of delivery. Because it is difficult for every pregnant woman to accurately determine the time of conception, it is medically stipulated that the due date is calculated from the first day of the last menstrual period. It should be noted that the due date is not the exact date of delivery. The due date is only the approximate time of delivery for pregnant women, which allows pregnant women to prepare for being a mother. As long as the baby is born within 2 weeks before or after the due date, it is considered a full-term baby. Because the due date itself is different from the date of conception. In addition, the time of birth of the fetus is affected by factors such as the intrauterine environment, fetal development, the physical condition of the pregnant woman and the actual environment, so the birth time cannot be accurately predicted. Therefore, it is not certain whether the due date is generally advanced or postponed.

It is normal to give birth within 14 days (2 weeks) in advance of the due date. The due date is the expected delivery time of the pregnant woman. It is a reference date estimated by medicine based on the last menstrual period. The due date itself is different from the date of conception. In addition, the length of each woman's menstrual cycle is different. The time of birth of the fetus is affected by factors such as the intrauterine environment, fetal development, the physical condition of the pregnant woman and the actual environment. The birth time cannot be accurately predicted. Therefore, it is very normal for the estimated due date to differ from the actual due date by 1-2 weeks. Generally speaking, it is normal to give birth within 2 weeks before or after the due date. And those who give birth within 38 to 42 weeks of the due date are considered full-term babies. Therefore, it is normal to give birth within 14 days (2 weeks) in advance of the due date.