Anterior and Posterior Placenta: What Is The Difference?

The Placenta is an organ that develops and grows in your uterus in pregnancy. So, Anterior and Posterior Placenta: What Is The Difference?


This structure provides oxygen and nutrient to the developing fetus and removes waste from the baby’s blood.

It attaches to the wall of your uterus and the position of it determines the nature of the type of birth you will have, vaginal or cesarean.

There are 4 positions for the placenta and all are normal for it to implant and grow:

pregnant belly posterior placenta

1. anterior = front ( closest to the belly)

2. posterior = back (by your spine)

3. fundal = top of the womb

4. lateral = left or right side of womb


The main positions are anterior and posterior, those are the ones that get all the fuss. Anterior and Posterior Placenta are both normal. The major difference is that if you have Posterior placenta then you will be able to feel the babies movement early in pregnancy.

Posterior Placenta

It is usually the best location for the baby. It gives them the ability to move into the anterior position right before birth. This position does not affect or interfere with the growth and development of the baby in any way.

Anterior Placenta

Having an anterior placenta may create space between the baby and your abdomen. This may diminish the sensation of the baby’s movements.



“Neither posterior or anterior placental location will affect the development or growth of a strong and healthy baby. “
Anna Targonskaya, MD – Medical Consultant. Ob/Gyn

Delivery Based on Position

In pregnancy, the position of the placenta may change or stay where it implanted. If it does change then a few things can happen.

The following are cases that highly likely will end up being a cesarian section as birth and are high risk. They may result in post-delivery hysterectomy.


Placenta Previa

This one is problematic as what happens is that the placenta grows towards the cervix and in this position, it can detach from the uterine wall and cause premature labor or internal bleeding.


Placenta Accreta

The placenta attached to way too deep into the uterine wall and instead of detaching completely at delivery it can leave pieces. This can end up resulting in heavy bleeding which can result in hemorrhaging.


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Sources & References:

Adapted from Flo Health, Posterior Placenta Location. Is Posterior Positioning Good for the Baby?