The chances of having twins are about 1 in 250 pregnancies.

However, there are some factors that may increase the likelihood, including:

Age

Women who are over 35 are more likely to have non-identical twins because they are more likely to release more than one egg during ovulation.

Height

Taller women are slightly more likely to have twins.

Weight

Women who are overweight or obese may be slightly more likely to have twins. Obesity can change hormone levels, which may increase the odds of hyperovulation.

Family history

A family history of twins may increase the odds. However, if a family seems to have skipped a generation, it may be because the person who could have carried the twin genes was male.

Fertility treatments

The use of fertility treatments, such as fertility drugs, has increased the birth rate of twins.

There are two types of twins: identical (monozygotic) and fraternal (dizygotic). Identical twins do not run in families, but fraternal twins can run on the mother's side of the family