Twin Ultrasound at 6 Weeks: Detection & Risk

All types of twins can be detected on a twin ultrasound at 6 weeks. This means that you can detect all types of twins at 6+0 weeks.

By Kate Phillipa Clark

A twin ultrasound at 6 weeks need to be done vaginally to detect twins this early in your pregnancy. When you’re 6+0 weeks pregnant, your babies hearts should be beating – and the sonographer should be able to detect them at this point. This is when you’ll know for sure whether or not your expecting twins.

Can a twin vanish from an ultrasound?

Yes. There is a risk that you’ll see two heartbeats in an early scan and only one in a later scan. Both scans are usually accurate, but you’ve experienced Vanishing Twin Syndrome. Vanishing Twin Syndrome is a miscarriage of one of the twins, but without bleeding or any other signs you’d usually contribute to a miscarriage. The miscarried twin has died in the womb and is partially or completely reabsorbed by the other twin or the mother. Vanishing Twin Syndrome usually happens early on in the pregnancy, in the first trimester. In the majority of cases, the surviving twin is not affected by the miscarriage of the other twin.

Can a twin be found later in the pregnancy?

There’s always the risk that a sonographer can overlook a second baby, but the advances in ultrasound technology have reduced the occurrences of overlooking a baby. If you don’t get ultrasound scans there’s a much higher probability that your twin pregnancy will be overlooked.


twin ultrasound 6+4 weeks mo-di twins   twin ultrasound 6 weeks

Monochorionic-diamniotic twin ultrasound pictures


About the Author

Kate Phillipa Clark

Kate Phillipa Clark has a bachelor in Journalism and an Executive Master in Corporate Communication. She is an identical twin and so is her father.


  1. Stacy / 30. October 2018 at 11:29 pm /Reply

    Hello iv had all 3 types of twin pregnancy my first I have my scan pictures of one baby….at 17 weeks I started to bleed baby was lost came out in bath I was still sore still bleeding a few weeks had passed I went back to hospital and there was my baby but how i buried the little baby only weeks earlier??? I was told twins and I’d lost one and they hadn’t seen the second baby. Gave birth to second baby via csection. 2nd pregnancy again twins ha e my scans to confirm go back 3 week’s later and one has no heart beat return a week later no trace of twin 2 they tell me it’s vanishing twin syndrome. Give birth to other twin as normal. 3rd pregnancy again twins confirmed have scans…monitored every 2 weeks as history and gave birth to 2 healthy twin girls…

    • Kate Phillipa Clark / 2. November 2018 at 9:27 am /Reply

      Hi Stacy,

      Sorry for the losses you have gone through – and a deep felt thank you for sharing your story!

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