The formation of the placenta begins to form as soon as the fertilized egg attaches to the wall of the uterus, and its growth is almost complete and begins to complete its functions at the 12th week of pregnancy, which is to deliver everything that the fetus body needs through the umbilical cord, as well as to get rid of waste by delivering it to the mother’s body for disposal, There are several positions of the placenta, including:

• Anterior, i.e. in front of the stomach.
• top of the uterus.
• on one side of the uterus.
• Below the uterus, sometimes covering part or all of the cervix.
• back, i.e. the back and spine.

The posterior or on top of the uterus is the most common position. The reason for the placenta shift is not clear, but it is believed that the placenta tends to grow in areas rich in blood vessels.

In general, the location of the placenta is observed during routine ultrasound examinations at approximately the 20th week, and the sources indicate that undergoing an ultrasound examination in the early stages of pregnancy, and noticing the presence of the placenta in a position such as the bottom of the uterus, does not necessarily mean that it will continue in this position when the date approaches. Childbirth, as the position of the placenta may change with the expansion and growth of the uterus during pregnancy, and another ultrasound examination is performed in the last trimester of pregnancy to confirm its position and assess whether it will affect natural childbirth, and the need to undergo a cesarean section.

Bottom line: the position of the placenta changes with the expansion of the uterus during pregnancy, while the placenta itself does not move, and you must follow up with the doctor, follow his instructions for a healthy and safe pregnancy, and receive your baby safely.