There are several natural ways for a woman to increase her chances of having twins, including having a family history of twins, taking folic acid supplements before conception, eating certain foods like cassava fruit and dairy, maintaining or gaining a modest amount of weight, continuing to breastfeed if nursing your youngest child, and attempting to get pregnant at an older age of around 35 years old. Taking fertility drugs can also increase the likelihood of conceiving twins by causing the body to release multiple eggs during ovulation.