This results in an imbalanced blood flow from 1 twin (known as the donor) to the other (recipient), leaving 1 baby with a greater blood volume than the other. It's caused by abnormal connecting blood vessels in the twins' placenta. The risk is higher for MCDA twins, but it can happen in MCMA twins, too. Twin-twin transfusion syndrome (TTTS) affects identical twins who share a placenta (monochorionic). Your obstetric team will work closely with you throughout your pregnancy and after your babies are born to help make sure you and your babies are safe and healthy. If you turn down the offer of a planned birth, you will be offered weekly appointments with an obstetrician and weekly ultrasound scans plus a foetal growth scan every 2 weeks. Plans for the birth will be discussed with you taking into account your needs and preferences. It can be dangerous for twin and triplet pregnancies to carry on after the planned birth dates. 35 weeks for an uncomplicated triplet pregnancy.36 weeks for identical twins sharing a placenta.37 weeks for twins with a placenta each.If you are expecting twins or triplets, you will be offered a planned birth at: Almost 8 in 10 triplets are born before 35 weeks. Most twins and triplets are born prematurely.Īround 6 in 10 twins are born before 37 weeks. Twins and triplets have a higher risk of being born prematurely (before 37 weeks) and having a low birthweight. Make sure you go to all your antenatal appointments so any problems can be picked up early and treated if necessary. If you're pregnant with more than 1 baby, you're at higher risk of pregnancy complications, such as iron deficiency anaemia and pre-eclampsia. While most multiple pregnancies are healthy and result in healthy babies, there are more risks to be aware of when you're pregnant with 2 or more babies. It's important to attend all your appointments so any problems can be picked up early and treated if necessary. If your babies are DCDA, the risks to their health in the womb are much lower. These types of twins are rare, and you can expect to receive specialist care and close monitoring. With this type of twins there's often some cord entanglement, which can cause complications. If your babies are MCMA, you'll also have frequent scans. You may be referred to a regional centre for foetal medicine to be seen by a specialist doctor. If your babies are MCDA, you can expect more scans and monitoring, as this type of twins has the highest risk of twin-twin transfusion syndrome (TTTS), which is an abnormality of the placenta. Most identical twins are MCDA, but some will be DCDA. monochorionic monoamniotic (MCMA) twins – share both a placenta and a sac – this is a much rarer type of pregnancy.monochorionic diamniotic (MCDA) twins – share a single placenta but have their own separate sacs.dichorionic diamniotic (DCDA) twins – each has their own separate placenta and separate sac.These apply to triplets too, although a triplet pregnancy will be more complex than a twin one. Different types of twinsįor medical purposes, there are 3 types of twins. You'll also be offered a scan, called an anomaly scan, at 20 weeks to check that your babies are developing normally. You can also have a nuchal translucency test for Down's syndrome done at the same time if you wish.įind out more about screening for Down's syndrome This is the best time to find out what type of placenta and membranes your twins have (chorionicity) and check your dates. It's important to attend this appointment. Women with multiple pregnancies should be offered an ultrasound scan at around 11 to 14 weeks. The number of tests and scans you'll be offered will depend on the type of twins or triplets you're having. Your antenatal team should be experienced in caring for women having twins or triplets. When you're expecting twins or triplets, it's important that you attend all your appointments because of the increased risks with this type of pregnancy.
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