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Posterior Placenta Location: Is Posterior Positioning Good for the Baby?

When you become pregnant, your body begins to adjust to the fetus and undergoes many changes. One of these changes is the growth of the placenta in your uterus.
Contents
Development
What is posterior placenta?
Effect on delivery
Anterior vs. posterior

The placenta is a temporary organ that attaches itself to the uterus and to the fetus | s umbilical cord. It | s through the placenta that the growing fetus is able to get oxygen and nutrients.

The positioning of the placenta is very important and determines whether you will be able to give birth vaginally or if a cesarean section will be safer.
Placental development stages

By attaching itself to the fetus | s umbilical cord, the placenta provides the fetus with nourishment and oxygen while also eliminating the fetus | s waste.

How does the placenta develop?

The placenta begins to grow when the blastocyst implants itself into your uterus. The blastocyst is the bunch of cells, referred to as the inner cell mass, that develops into the embryo. The outer cluster of cells, known as the trophoblast, forms the placenta.

The trophoblast grows quickly, and its cells split into two layers: cytotrophoblasts, which are the inner cells, and syncytiotrophoblasts, which are the outer cells.

The inner cells of the placenta reshape blood vessels in your uterus. This is how the placenta receives blood to provide the fetus with nutrients.

The placenta develops wherever the fertilized egg embeds itself in your uterus:

Anterior position — on the front wall of your uterus, closest to the belly
Posterior position — on the back wall of your uterus, closest to the spine
Fundal position — on the top wall of your uterus
Lateral position — on the right or left side of your uterus

These are all normal places for the placenta to implant and grow.

When the placenta attaches itself to the back of the uterus, it is called a posterior placenta. When it attaches itself to the front of the uterus, it is known as an anterior placenta.

The placenta undergoes numerous changes from conception to birth. As the fetus grows, the placenta grows to accommodate their development. By the time you give birth, the placenta may weigh as much as a pound (500 grams) and measure 9 inches in length. After the baby is born, your uterus will also contract to expel the placenta.

The term posterior placenta describes the placenta | s attachment to the back wall of the uterus.

If your health care provider determines that you have a posterior placenta, there | s no need to worry. It | s completely normal. The upper (or fundal) portion of the uterine back wall is one of the best locations for the fetus to be in. It allows them to move into the anterior position just before birth.

Furthermore, a posterior placenta does not affect or interfere with the growth and development of the fetus.
A pregnant woman having a posterior placenta looking at the ultrasound image of her baby
How does placenta positioning affect delivery?

During pregnancy, the placenta location can change. This is why your health care provider may perform an ultrasound scan in the second trimester of pregnancy (roughly 18 to 21 weeks). Another scan may be necessary in the third trimester to double-check placenta positioning before delivery.

One placental location that might be problematic is when the placenta grows toward the cervix. This is called placenta previa. In this position, the placenta could detach from the uterine wall and cause premature labor or internal bleeding.

Another condition, known as placenta accreta, happens when parts of the placenta attach too deeply into the uterine wall. Instead of completely detaching itself after delivery, some or all of the placenta remains in the uterus, sometimes resulting in bleeding.

In such cases, your health care provider may recommend a caesarian section and a post-delivery hysterectomy.

In some rare instances, the placenta remains in the uterus after the baby has been delivered. This is called a retained placenta, and when left untreated, it can lead to complications including infections and heavy vaginal bleeding.
Anterior vs. posterior placenta

To recap, a posterior placenta is one that attaches itself to the back of the uterus, while an anterior placenta attaches itself to the front. Both placental positions are considered normal. Aside from being an ideal location for delivery, the other benefit of a posterior placenta is being able to feel your baby | s movements early on.

This is not the case with an anterior placenta because the placenta may create more space between the baby and your abdomen. Neither posterior or anterior placental location will affect the development or growth of a strong and healthy baby.