How long does it take for the placenta to form?

After pregnancy, the amniotic fluid of the pregnant woman can provide certain nutrients for the fetus. The embryo and the amniotic fluid of the pregnant woman are very important for the development of the fetus. They are also the important organs connecting the pregnant mother and the fetus. The embryo and amniotic fluid do not appear at the beginning of pregnancy. How long does it actually take for the embryo and amniotic fluid to appear during pregnancy? The following is a detailed introduction for everyone.

How long does it take for the embryo and the amniotic fluid to form?

At 11 weeks of pregnancy, the gestational sac disappears completely, and the embryo is produced at this time. As for the amniotic fluid of pregnant women, in the early stage, it is mainly produced by the metabolism of amniotic epithelial cells and the transportation of the amniotic membrane. The amniotic sac will slowly begin to form on the eighth day after fertilization, and there will be amniotic fluid at this time. With the increase of pregnancy time, the amniotic membrane will gradually expand, and the amniotic fluid flow will gradually increase.

The amniotic fluid of pregnant women can alleviate the impact of external vibrations on the baby and prevent the mother from feeling uncomfortable when the baby moves. In addition, the antibacterial components in the amniotic fluid of pregnant women reduce the chance of infection in the baby. The lubricating effect of the amniotic fluid of pregnant women helps pregnant mothers to have a successful delivery. Doctors can understand the physical condition of the baby through amniotic fluid testing. Under normal circumstances, the amniotic fluid of a pregnant woman at 16 weeks of pregnancy is generally 250ML, and can reach 1000ML at 36 weeks of pregnancy. In the late stages of pregnancy, if the amniotic fluid is less than 300mL or more than 2000mL, it is extremely bad for the development of the baby and needs to be closely monitored.

The amniotic fluid of pregnant women is very important for the fetus, and the amniotic fluid flow will have different indicator ranges in each stage of pregnancy. In the tenth week of pregnancy, the amniotic fluid flow is only 30 ml. In the twentieth week of pregnancy, the amniotic fluid flow will increase to 35 ml. It will reach a peak in the seventh month of pregnancy, and will gradually decrease in the last two months. Before birth, the amniotic fluid flow is generally around 1,000 ml. If it exceeds 1,500 ml, it is a case of polyhydramnios, indicating that the fetus's central nervous system development is impaired or the upper gastrointestinal tract is blocked. If it is less than 500 ml, it is a case of oligohydramnios, which indicates that the fetus's kidneys are defective or dysplastic, or there is urethral obstruction.