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Twins: how they happen and pregnancy considerations
There is no reliable way to choose a twin pregnancy. Fertility treatment should aim for a healthy pregnancy, and multiple pregnancy brings additional risks for the pregnant person and babies.
Fertility treatment and the risk of twins
Fertility medicines and IVF should not be used simply to try for twins. Some treatments increase the chance of a multiple pregnancy, which carries greater risks, including premature birth. A fertility specialist can explain appropriate treatment and ways to reduce this risk. Transferring a single embryo reduces the chance of fraternal twins, although an embryo can occasionally split into identical twins.
Sources: Better Health Channel: IVF and ICSI; Pregnancy, Birth and Baby: twin pregnancy.
“If trying to fall pregnant, you must visit the doctor to review your health, should track your ovulation cycle, consume folic acid, maintain a healthy weight, exercise and eat well.”
Check out our article 12 things to do when trying to fall pregnant
Factors associated with twin pregnancy
The inherited detailed claims about family history, height and ethnicity are on hold pending qualified editorial review. These claims should not be used as personalised predictions or methods for trying to have twins.
Age
Age can affect the chance of fraternal twins, but overall fertility declines with age. Delaying pregnancy to try for twins is not a reliable strategy.
Weight
Work towards a healthy weight for you with your health professional; changing your weight is not a recommended way to try for twins.
Diet
The evidence cited here does not establish a diet that reliably produces twins. Choose a balanced diet that meets your needs when planning pregnancy.
Sources: Better Health Channel: twins; healthdirect: planning pregnancy.
If you are planning a pregnancy, focus on your health and speak with your GP about preconception care. Do not take fertility medicines or seek extra embryo transfers simply to increase the chance of twins.
A home pregnancy test can indicate pregnancy, but it cannot tell you whether you are having twins. Your care team can confirm a multiple pregnancy with an ultrasound.
Sources: Better Health Channel: twins.
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