Tall woman more likely have twins or triplets

The difference in average height between mothers of single and multiple-birth babies in the U.S. is 1 inch, and research shows being tall increases a woman's chance of having twins or triplets. The reason? taller people have more insulin like growth factor, which increases the chance of spontaneous twinning. Previous studies have found that women who consume animal dairy products were 5 times more likely to have twins; because cows produce insulin-like growth factor and release it into the blood, and the protein makes its way into their milk.