28th November 2019

babycenter
16

What makes you more likely to have twins?

Heredity: If you're a twin, or if there are twins in your family, you're slightly more likely to have a set yourself. Age: The older you are, the higher your chances of having fraternal twins or higher order multiples. Women age 35 or older produce more follicle-stimulating hormone (FSH) than younger women.

Who carries the gene to have twins?

A man who carries the gene doesn't have a greater chance of having twins himself because his genes don't affect his partner's ovulation. By contrast, identical twins don't run in families. The splitting of a fertilized egg seems to happen at random.

How does having twins run in the family?

Non-identical (fraternal) twins tend to run in families. But identical twins don't. Non-identical twins are the result of two separate eggs being fertilised by two separate sperm. There is a gene that makes a woman more likely to release two or more eggs during ovulation, and it's this gene that runs in families.
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