About three or four in every 1000 births are identical twins. There are different types of twins, identical and fraternal being the most common. Identical, or monozygotic, twins develop from the ...

Fraternal twins, which are the more common type, occur when two separate eggs are fertilised by two different sperm. These twins can have different genetic makeups and may or may not be of the ...

“Understanding the different types of twins can give parents insight into the fascinating variations that may emerge during gestation.” Whether you're pregnant with twins or just curious about ...