Although fertility drugs and treatments are the primary reason, there are others, like where live. A study by the National Center for Health Statistics found if you reside in Massachusetts or Connecticut, the rates for twin deliveries was as much as 25 percent higher than the overall national rate. But, what about triplets? Try living in Nebraska or New Jersey, where both states boast a percentage of triplets that is twice the national average. On the other hand, if you reside in tropical Hawaii your chances of having a multiple will decrease to about 30 percent below the overall U.S. rate.

And another interesting fact is that the time of year and the number of daylight hours also affect multiple births. More twins are conceived in July than in any other month, while January has the fewest twin conceptions. Scientists speculate that this is probably due to the longer length of daylight in July, which allows for a higher secretion of the follicle stimulating hormone in women.

Better and more accessible medical care and good nutrition might play a role in skyrocketing multiple birth rates, although it is difficult to directly link these influences. In fact, if access to state-of-the-art medicine were a deciding factor, then why does the Yoruba tribe of Nigeria have the highest incidence of twins in the entire world? These Nigerian people attribute their high twin birth rate to their consumption of a yam. According to scientists, these colorful African vegetables contain a high level of a substance that is similar to the hormone estrogen, which could bring on multiple ovulation.

Age can also work in a woman's favor when it comes to conceiving twins. Older mothers traditionally have a higher chance of delivering twins, with the odds increasing to 1 in 27 when the mother is 35 years or older. While identical twins have no familial connection, fraternal twins can run in the family. Female fraternal twins score an impressive 1 in 17 chance of giving birth to their own set of fraternal twins, probably because many carry a gene for hyperovulation, which means they sometimes release more than one egg during ovulation. And, if a woman has already given birth to fraternal twins, the chance of another set increases four times.

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