1. Women who are older are more likely to have twins. However, the risks also increase; older mothers have a higher rate of miscarriage.
2. Increase the intake of dietary products: Women with adequate intake of dairy products increase their chances of having twins by 5 times.Eat wild yams. The theory comes from Africa.
A small town in Nigeria claims to have the highest rate of twins in the world. There may be a chemical in wild yams, or cassava root, which may cause hyper stimulation of the ovaries, resulting in the release of more than one egg during ovulation.
3. Continue breastfeeding. According to one twins study, women who were breastfeeding when they conceived were nine times more likely to conceive twins than women who are were not breastfeeding.
4. Try to conceive shortly after stopping birth control pills. If a woman has been using the pill for six months or more her body adjusts to the birth control controlling her hormones. So when she stops taking these pills her body starts regulating its own hormone production again, which at times lead to too much hormone stimulation. This can cause the ovaries to release one too many eggs during the first ovulatory cycle or two after discontinuing the pill.
source : thehealthylifestyle365.com