17-Be heavier rather than lighter
Some researchers claim that women with a BMI of greater than 30 are far more likely to conceive twins than those with a smaller BMI. However, considering a healthy range during the fertile years is 20-25 and 30 would put you into the overweight/obese category, then this is definitely not a healthy recommendation.
18-Have your partner eat foods which are rich in zinc
Foods which are high in zinc, such as oysters, green leafy vegetables, seeds, and bread, will help with sperm production – thus increasing his likelihood of being able to fertilize more than one egg.
19-Try to conceive after having another baby
Women who have previously had a baby or two have a higher chance of conceiving with twins.
20-Your own twin status
Are you a twin yourself? Mothers who are twins are more likely to have twin babies of their own.