Better Health Channel
  • Twins account for 98 per cent of multiple births.
  • Multiple births in Australia have remained relatively stable. In 2021, multiple births accounted for 2.7 per cent of births, which is a very slight decrease in the last decade.
  • To form identical or monozygotic twins, one fertilised egg (ovum) splits and develops into two babies with exactly the same genetic information.
  • To form fraternal or dizygotic twins, two eggs (ova) are fertilised by two sperm and produce two genetically unique children.
  • Triplets are usually a combination of the types of twins, with a set of identical twins (two) and a fraternal (one) triplet.
  • Stay in regular contact with your care team (GP, midwife, obstetrician) as multiple pregnancies and births are associated with an increased number of health risks to both mother and babies.
  • If you are carrying more than one baby, it is best to give birth in hospital rather than at home.

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Reviewed on: 11-07-2023