How many weeks is a normal pregnancy and how many weeks is a baby born?

The total time of pregnancy is 40 weeks, generally from the first day of the last menstrual period, a total of 280 days and 40 weeks.

Of course, there are also pregnant women who give birth early and will give birth before 40 weeks, and there are also some pregnant women who give birth after 40 weeks, which is normal.

We call it full-term before 37 to 42 weeks of gestation, during which the newborn is delivered at term and has a good prognosis. If the baby is delivered before 37 weeks, it is called preterm birth, and the newborn may need special care; Post-term pregnancy occurs after 42 weeks of gestation, and the prognosis for newborns born at this time may be poor.

Generally, the due date of pregnancy is 40 weeks, that is, 280 days of pregnancy is the due date, and the fetus is full-term from 37 weeks of pregnancy. Births between 37 and 42 weeks are called full-term pregnancies. Children born after 28 weeks and before 37 weeks are called preterm babies, so it is normal to be born between 37 weeks and 42 weeks.

In addition, the expected date of delivery can be calculated by yourself, from the first day of the last menstrual period to calculate the expected date of delivery is the month of that month, if it is greater than 3, subtract 3, if the month is less than 3, add 9 is the month of birth, and if the date is calculated by the lunar calendar, the date of the last menstrual period plus 14 days is the date of birth. In the Gregorian calendar, 7 days are added to the date of birth.

During normal pregnancy, children born between 36 and 40 weeks are normal.

Generally speaking, we often refer to term as 40 weeks of pregnancy. Births between 37 weeks and less than 42 weeks are considered normal.

For women with normal pregnancies, how many weeks the baby will be born depends on the specific situation of each woman. Some women are 37 weeks pregnant, and they may have a labor episode at any time, and the baby will be delivered out of the uterine cavity, so it may be born at any time after 37 weeks of pregnancy. It could be 37 weeks, it could be 38 weeks, it could be 40 weeks, or it could even be 41 weeks pregnant.

Extended Materials. 1. Pregnancy refers to the presence of one or more fetuses or embryos in the body of a mammalian female (including humans). Human gestation is the most studied in mammals. A human pregnancy lasts about 40 weeks from the last menstrual period to delivery (38 weeks from ovulation).

Childbirth is the term for childbirth. Many societies, as well as laws, divide pregnancy into three stages. There is a high risk of miscarriage in early pregnancy.

From the middle stage, the fetus develops enough to be tracked. In later stages, the fetus begins to have the ability to survive outside the mother. Because of this ability, many laws and customs treat the fetus at this time as an individual.

2. B-ultrasound is the most correct and reliable method to diagnose early pregnancy. As early as the 5th week of pregnancy, that is, the week of menstruation, the B-type ultrasound screen can show that there is a circular halo in the uterus, also known as the pregnancy ring, and the dark area in the ring is amniotic fluid, in which a rhythmic fetal heart beat can also be seen.

3. After pregnancy, a new hormone is produced in the pregnant woman's body, called chorionic gonadotropin, which is conducive to maintaining pregnancy. This hormone can be detected in the urine about 10 days after conception. Anyone who detects chorionic gonadotropin in the urine is normally pregnant.

Therefore, testing for chorionic gonadotropin in urine is called a pregnancy test. For urine pregnancy tests, morning urine must be used because morning urine is concentrated and hormone levels are high. To increase the positive rate of the test, water intake should also be minimized the night before.

It is best to take the container from the hospital laboratory beforehand, because there are preservatives in it, the urine is not easy to deteriorate, and if there is no condition, any jar can be used, but it needs to be washed, boiled and sterilized or rinsed with boiling water. After collecting about 10 ml of morning urine, send it to the hospital for laboratory testing quickly, if the time is too long, it can affect the correctness of the test, especially in summer, you should pay attention to this.

4. Because it is difficult for every pregnant woman to accurately judge the time of conception, it is medically stipulated that the expected date of delivery is calculated from the first day of the last menstrual period, and the entire pregnancy period is 280 days, 10 gestation months (each gestation month is 28 days, and the fetus grows in the mother's body: it should be 40 weeks, that is, 280 days. ）。

Pregnant women give birth within 38-42 weeks of gestation, both at term. Since the length of each woman's menstrual cycle varies, it is normal for the estimated due date to differ from the actual due date by 1-2 weeks.

How many weeks is a baby born? Generally, the child is born around 40 weeks of pregnancy.

The normal pregnancy cycle is 40 weeks, and the due date is also calculated from the first day of the last menstrual period and backwards to 40 weeks. From the first day of the last normal menstrual period to the time of delivery, and the gestational age is expressed in weeks, medically each gestation month is 4 weeks, and 40 weeks of pregnancy is 10 months, so there is a saying that the pregnancy is in October. However, only about 5% of the births are due date, and most of the children are born at gestational weeks that are not on the day of the due date, but as long as they are 37 weeks pregnant, they are full-term, and newborns born at 37 and 41 weeks of pregnancy are normal full-term mature babies.

According to the gestational age of the child, it is generally divided into:

Term infant: Refers to a fetus born between 37 weeks and 41 weeks (260 293 days) of gestation.

Postterm baby: refers to a fetus that is delivered at 42 weeks (294 days) gestation.

Preterm (less than a month): A fetus born at 37 weeks (259 days) of gestation.

Preterm infants are further divided into the following three subtypes according to the specific gestational age:

Extremely preterm infants: Babies who are born at 28 weeks of gestation.

Early preterm infants: fetuses that are delivered at 28 to 32 weeks of gestation (between 28 and 32 weeks).

Mild preterm infants: fetuses that occur at 32 to 37 weeks of gestation (between 32 and 37 weeks).

Therefore, babies born between 37 weeks and 42 weeks of gestational age are full-term.

This content was reviewed by Zhang Liju, Chief Physician of the Department of Obstetrics and Gynecology, Beijing Ditan Hospital, Capital Medical University.

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As long as the pregnancy is full of 37 weeks, that is, the baby born after 37 weeks (including 37 weeks) is full-term, and the baby born earlier than 37 weeks is called a premature baby. A normal full-term baby is born within 37 weeks and 42 weeks (260,293 days) of pregnancy.

During pregnancy, you should pay attention to the on-time prenatal examination, timely check the baby's development and the mother's physical condition, you can find the national mother's customer service to ask for a copy of the prenatal examination, which is very detailed for the introduction of the prenatal examination, or free to receive.