Take a folic acid supplement: There have been a few studies on the link between folic acid and conceiving twins. One Australian study found that women who took folic acid before they got pregnant were more likely to conceive twins. In fact, according to this study, you may have a 40% or greater chance of conceiving twins if you take folic acid while you are trying to conceive. Some other studies have shown contradictory results making it hard to say for sure if folic acid actually increases your odds of conceiving twins. Nevertheless, folic acid also helps to prevent neural tube defects so it is a good idea to take a folic acid supplement (or a multi vitamin with folic acid) even if you aren’t trying to conceive twins.
Gain weight: A study published in the March 2005 issue of Obstetrics & Gynecology found that women who were overweight had a higher chance of having twins. Women who were tall also had a higher chance of having twins.
Eat dairy products: According to a recent study by Dr. Gary Steinman, a physician at Long Island Jewish Medical Center who is well known for research on multiple birth pregnancies, women who eat dairy are five times more likely to conceive twins than women who don’t. Dr. Steinman’s study compared women who ate a regular diet with vegan women and vegetarian women who consumed dairy products. Vegans appear to be less likely to conceive twins according to the study. But, it may not be so much that consuming dairy increases your chances of having twins; but rather, that consuming milk or other dairy products from growth hormone treated cows increases your chances of having twins.
Continue breastfeeding: If you are breastfeeding and would like to conceive twins, you may want to hold off on weaning your little one. According to one twin study, women who were breastfeeding when they conceived were nine times more likely to conceive twins than women who are were not breastfeeding.