Taking fertility drugs as well as multiple egg implantation via IVF can often increase the chance of multiples.
Although a terribly sad event for any parent, sometimes a blessing can follow. Anecdotally, women are more likely to conceive twins after a miscarriage.
16-Eat more yams / sweet potatoes
It’s a fact that women who naturally conceive twins tend to live in areas where yams are a major part of their diet. Yams are supposed to increase the fertility of a woman and improve the ovulation process as well, thereby increasing the chances of getting twins.