ehow.com gives a nice summary:
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Fertility Awareness is key to conceiving twins
Learn Fertility Awareness and how to monitor the female cycle to pinpoint the optimal time for intercourse. Having sex at the fertile time of the cycle is necessary to learn how conceive twins (or even one baby).
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Take folic acid to help conceive twins naturally
Take folic acid daily to conceive twins. Folic acid is important for any healthy pregnancy, and it has also been shown to increase the likelihood of conceiving twins--an additional one woman out of 176 taking folic acid will bear twins, as compared to women not taking the supplement.
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Cassava Root (Image courtesy International Institute of Tropical Agriculture)
Eat cassava root, a type of wild yam found in Africa. In a region in Africa where cassava is a staple of the local diet, women have the highest rate of twins found anywhere in the world. Many nutrition researches agree that eating this yam is how to conceive twins.
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Drink milk--it may factor in how to conceive twins
Drink milk and eat beef to increase the odds of having twins. According to Dr Gary Steinman, lead scientist in a medical study of twins, women who have a milk-based diet are more likely to conceive twins naturally than their vegan counterparts. It is thought that natural properties in milk may stimulate the ovaries, encouraging the production of multiple eggs for conception.
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Breastfeed while you TTC twins
Keep nursing your infant or toddler while you try to conceive twins naturally. According to one study, women who are still breastfeeding and yet fertile are slightly more likely to produce twins.
6Step Six Click to enlargeGain a little weight. Women with slightly higher fat percentages and those who are a little overweight are more likely to have twins. Don't overdo it, however--your health is especially important during pregnancy.
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How to Conceive Twins
Have a family history of fraternal twins. This one is out of your control, but if the mother has fraternal twins in her family, she is more likely to have twins of her own. You can learn how to conceive twins (or improve the chances of conceiving twins) without a family history, but it helps.
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