There is no definite recipe for becoming pregnant with twins. Multiple factors such as genetic predispositions of both partners, combined with lifestyle choices, as well as age and timing all have to come together for this to happen.
There have been various scientific studies, however, which have identified different factors that increase the likelihood of bearing twins. Bear in mind, however, that these are just single pieces of a much larger puzzle.
A study published by the American College of Obstetrics and Gynecology has linked the birth of twins to women of above average height. The average height of the world’s female population is 5′ 4″ and according to this research, the chances of having twins grow exponentially if the woman is taller than the average.
Some studies have shown that African-American women are more likely to have twins than women of other races. Genes have a large impact on whether or not a woman will give birth to fraternal (dizygotic) twins; West Africans are ten times more likely to have fraternal twins than Chinese or Japanese mothers, with Caucasian women somewhere in between. It can be deduced that if an African-American woman’s family has West African genes, the likelihood to give birth to twins increases.
3. On the Pill
The pill is considered an effective birth control method for 99.9% of women. It is believed that the hormonal mix of birth control can lead to hyper-ovulation, and among women who take the pill inconsistently or fall within the .01 percent where this method of birth control has proven ineffective, the probability of multiple twins greatly increases.
The American College of Obstetrics and Gynecology study mentioned above also noted the rise in multiple birth rates among heavier women. The research found that mothers with a BMI (Body Mass Index) of 30 or higher were significantly more likely to have fraternal twins.
5. If One Is a Twin
In the case of fraternal (dizygotic) twins, or unidentical twins, heredity plays a key role. Studies have shown that the more twins were born in your family during the past, the more likely you are to have twins, as the genetic trait is in your family gene pool. If you yourself are a twin, the chances are especially high.
Women who become pregnant later in life are statistically more likely to have twins. This is because the ovaries of older women release more eggs than the ovaries of a younger woman, generally increasing their chances of pregnancy and multi-pregnancy.
After insemination, older women have a much higher chance of having multiple eggs fertilized. Almost 20 percent of mothers who give birth over the age of 45 have multiples.
The commonly accepted theory that a woman cannot become pregnant while breastfeeding because the process of lactating keeps a woman from ovulating is a myth. Some research supports the theory that the chance of twins or multiples is increased if a woman conceives while breastfeeding. One study discovered that women who became pregnant while breastfeeding were nine times more likely to conceive twins than women who were not breastfeeding.
8. Having a Large Family
Women who have had a higher number of children – with the average being 2.5 – are more likely to conceive twins. This, however, probably has more to do with the probability theory, than with any hard fact.
9. Dairy Eating
There are studies that have claimed women who consume dairy are more likely to conceive twins due to the high presence of synthetic hormones in milk products. However, studies exist who claim exactly the opposite as well, therefore take this one with a pinch of salt, or a glass or milk…
10. Already Had Twins
Once someone has their first pair of twins, the odds for having MORE twins goes up again!
So if you’re hoping for a Beyonce type bundle, according to this, you’d need to be a tall, over-weight, milk-guzzling, middle-aged woman from a large African-American family, who is already on the pill! Hmm, maybe just let nature take its course, eh?