Placenta complications

There are several things relating to the placenta that may affect your pregnancy and birth.

What is the placenta?

The placenta is an organ that helps your baby grow and develop. It’s attached to the lining of the womb and is connected to your baby by the umbilical cord. The placenta passes oxygen, nutrients and antibodies from your blood supply to your baby. It also carries waste products from your baby to your blood supply, so your body can get rid of them.

The placenta develops in the first few weeks of pregnancy, wherever the fertilised egg embeds itself. This could be along the top, sides, front or back wall of the uterus.

What issues can affect the placenta?

Anterior placenta

An anterior placenta is when the placenta attaches to the front wall of the uterus. This is a normal place for the placenta to implant and develop and it is very unlikely to cause any complications.

Having an anterior placenta can make it a bit harder to feel your baby move because your baby is cushioned by the placenta lying at the front of your stomach.

Find out more about anterior placenta.

Intrauterine growth restriction (IUGR)

IUGR also known as fetal growth restriction (FGR) is a condition in which a baby's growth slows or stops during pregnancy. Most cases of IUGR are caused by failure of the placenta but there are also other factors, including intrauterine infection and smoking in pregnancy

IUGR happens in around 3% pregnancies.

Find out more about Intrauterine growth restriction.

Low-lying placenta (also known as placenta praevia)

A low-lying placenta (also known as placenta praevia) is when the placenta attaches lower down and may cover a part of or all of the cervix (the entrance to the womb).

This can cause bleeding in pregnancy or during your baby’s birth, so you may need to give birth in the hospital. If the placenta is near or covering the cervix you won’t be able to deliver vaginally and will need a caesarean section.

Find out more about low-lying placenta.

Placental abruption

Placental abruption is a serious condition in which the placenta starts to come away from the inside of the womb wall before the baby has delivered. This is an emergency because it means that the support system for the baby is failing.

Placental abruption is rare, complicating about 1% of pregnancies.

Find out more about placental abruption.

Placenta accreta

Placenta accreta is when the placenta is attached and embedded too deeply into the wall of the uterus. This is a rare complication of pregnancy that makes it difficult to deliver the placenta after you give birth.

Find out more about placenta accreta.

Retained placenta

After your baby is born, your womb will carry on contracting and the placenta is delivered. This is called the third stage of labour.

Sometimes the placenta or part of the placenta or membranes can remain in the womb. This is known as retained placenta. It isn’t very common, but a retained placenta can cause complications if it isn’t treated.

Find out more about retained placenta.

Tommy's research

Tommy’s is the largest charity carrying out research into pregnancy loss and premature birth in the UK. We are funding various research projects that are focusing on the placenta and potential pregnancy complications. Find out more about our research.

Sources

NHS Choices. What is the placenta? https://www.nhs.uk/common-health-questions/pregnancy/what-is-the-placenta/ (Page last reviewed: 03/09/2018. Next review due: 03/09/2021)

Sharma D et al (2016) Intrauterine Growth Restriction: Antenatal and Postnatal Aspects. Clinical Medicine Insights: Pediatrics doi: 10.4137/CMPed.S40070 1

Royal College of Obstetricians and Gynaecologists (2019) Your baby's movements in pregnancy London RCOG https://www.rcog.org.uk/globalassets/documents/patients/patient-information-leaflets/pregnancy/pi-your-babys-movements-in-pregnancy.pdf

NHS Choices. What complications can affect the placenta? https://www.nhs.uk/common-health-questions/pregnancy/what-complications-can-affect-the-placenta/ (Page last reviewed: 26/09/2018. Next review due: 26/09/2021)

Royal College of Obstetricians and Gynaecologists (2018) Placenta praevia, placenta accreta and vasa praevia https://www.rcog.org.uk/globalassets/documents/patients/patient-information-leaflets/pregnancy/pi-placenta-praevia-placenta-accreta-and-vasa-praevia.pdf

[Oyelese Y and Ananth CV (2006) Placenta Abruption. Obstetrics and Gynecology. 2006 Oct;108(4):1005-16.

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    Last reviewed on July 12th, 2019. Next review date July 12th, 2022.

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