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, but there are a few things to be aware of if you have one.

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.

What is an anterior placenta?

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. If the placenta attaches to the front, this is called an anterior placenta.

People sometimes think that having an anterior placenta is linked to having a low-lying placenta but it is not. 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).

How will I know if I have an anterior placenta?

You’ll find out whether you have an anterior placenta during your second ultrasound scan when you are 18 to 21 weeks pregnant.

Can an anterior placenta cause complications?

This is very unlikely. The front wall of the uterus is a normal place for the placenta to implant and develop. An anterior placenta will still do its job of nourishing your baby, but there are some things to be aware of if you are diagnosed.

Feeling your baby’s movements

Most women usually feel their baby move between 18 and 24 weeks. If this is your first pregnancy, you may not notice your baby’s movements until you are more than 20 weeks pregnant.

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. However, it’s very important that you never assume that having an anterior placenta is a reason why you can’t feel your baby move.

Get to know your baby’s movements and be aware of them throughout your pregnancy. Contact your midwife or maternity unit immediately if you think your baby’s movements have slowed down, stopped or changed. It’s always best to get checked.

Some women may feel particularly anxious about their baby’s movements, especially if they’ve had difficult experiences in previous pregnancies. Talk to your midwife about how you feel. They may be able to reassure you or help you get more help and support, if you need it.

Find out more about your baby's movements.

Lower back pain

You may have lower back pain if you have an anterior placenta. Irritable back pain can be common in pregnancy and there are things you can do to try to ease it.

Screening and diagnostic tests

An anterior placenta can make it more difficult to perform certain tests, such as amniocentesis. Not all women are offered this test during pregnancy. You’ll only be offered this test if the results of your screening tests show that your baby has a high risk of certain conditions, such as Down’s syndrome.

The test involves inserting a long, thin needle through the stomach into the amniotic sac to remove a sample of cells so doctors can test for health conditions. Having an anterior placenta can make this more difficult, but doctors will use an ultrasound scanner to guide the needle and avoid the placenta. An ultrasound scanner is used to guide the needle, which significantly reduces the risk of injury.

There is a small risk of miscarriage after an amniocentesis test, regardless of where the placenta is. Having an anterior placenta does not increase this risk.

Your baby’s position in the womb

Having an anterior placenta increases the chances of the baby being in a back-to-back (occipitoposterior) position. This is when the baby’s head is down, but the back of their head and their back is against your spine.

If your baby is in a back-to-back position when you go into labour, it’s likely that your baby will turn into the best position for birth and you will have a normal vaginal delivery. But having a baby in a back-to-back position during labour does increase the chances of:

Talk to your midwife or doctor if you have any concerns about having an anterior placenta.

 
 

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)

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)

Clinical Knowledge Summaries (2019) Antenatal care – uncomplicated pregnancy https://cks.nice.org.uk/antenatal-care-uncomplicated-pregnancy#!topicSummary

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

Orvieto R (1994) Low-back pain of pregnancy Acta Obstetricia et gynecologica Scandinavia. 1994 Mar;73(3):209-14.

NHS Choices. Amniocentesis https://www.nhs.uk/conditions/amniocentesis/ (Page last reviewed: 21/04/2016. Next review due: 21/04/2019)

Kalogiannidis, I (2011) Amniocentesis-related adverse outcomes according to placental location and risk factors for fetal loss after midtrimester amniocentesis. Clinical and experimental obstetrics and gynecology 2011;38(3):239-42.

Macdonald and Gail Johnson (2017) Mayes’ Midwifery, Elsevier, London

The Royal College of Midwives Trust (2012) Evidence based guidelines for midwifery-led care in labour. Persistent lateral and posterior fetal positionsat the onset of labour https://www.rcm.org.uk/sites/default/files/Persistent%20Lateral%20and%20Posterior%20Fetal%20Positions%20%20at%20the%20Onset%20of%20Labour.pdf

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

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    Comments

    Please note that these comments are monitored but not answered by Tommy’s. Please call your GP or maternity unit if you have concerns about your health or your baby’s health.
    • By Coco (not verified) on 4 Dec 2019 - 14:33

      I've got an anterior placenta can feel baby move but not very often.

    • By Anonymous (not verified) on 15 Nov 2019 - 05:26

      I Have this , But now the bleed stopped. Should I worry ?

    • By Midwife @Tommys on 19 Nov 2019 - 12:26

      Hi, if you have bleeding at any gestation of pregnancy, this is not normal and will need urgent medical review at your maternity unit if you are over 16 weeks. If you are under 16 weeks, you will be seen in a&e minors or in an early pregnancy assessment unit. Please get urgent review if you have not already done so. Tommy's Midwife

    • By Anonymous (not verified) on 28 Oct 2019 - 12:07

      I have anterior plancenta, I can feel my baby's movement there is no back pain every thing is perfectly ok. A. Just waiting for the delivery date. Thanks

    • By onwudi Esther (not verified) on 15 Oct 2019 - 18:20

      I have this nd I wish to know if everything is ok

    • By Samantha Mccormack (not verified) on 23 Oct 2019 - 07:12

      I have an anterior placenta and have had no issues, only thing i would say is that movements from my baby are sometimes hard to feel because of it.

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