Fertility: Drugs increase the probability of multiple births. Naturally it just occurs and there is nothing you can naturally do to get twins.
Answered 3/23/2014
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By chance: Other than some fertility drugs which can increase the chances of multiple births, having twins is by chance. A family history of non-identical twins can increase your chances a little as well.
Answered 3/24/2014
4.3k views
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