5. The number of children you already have
This is just a case of odds, but research has shown that the more children you’ve had, the more likely you’ll conceive multiples at some age. Your chances are more if you already have twins.
6. Fertility treatment
One of the major factors that can boost your likelihood of having multiples is having fertility treatment, such as IVF. This is designed to increase fertility by boosting the number of eggs produced in a woman’s ovaries. And when more eggs are produced, more than one can be released and fertilized.