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Twin pregnancy |dizygotic twins

Identical twins

Identical (monozygotic) twins happen when a single egg (zygote) is fertilised.

The egg then divides in 2, creating identical twins who share the same genes.

Identical twins are always the same sex, so if your twins are identical, you'll have 2 girls or 2 boys.

Non-identical twins

Non-identical (dizygotic) twins happen when 2 separate eggs are fertilised and then implant into the womb (uterus).

These non-identical twins are no more alike than any other 2 siblings.

Non-identical twins are more common. The babies may be of the same sex or different sexes.

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