1. Women who take folic acid have nearly twice the chance of conceiving twins compared to those who do not. Among 2,569 pregnant women who had taken folic acid, 2.8 out of every 100 children born were twin babies, whereas in women who did not take folic acid, this proportion was 1.5. Experts estimate that folic acid supplements may increase the number of ovulations, allowing multiple eggs to enter the uterus, thus resulting in twins.
2. July is the best time to try to conceive and have twins, as the chance for fertilized eggs to develop into twins during this month is higher than in other months.
3. Learn from Nigeria, a West African country: [http://jxw1899.blog.hexun.com/59011724_d.html](http://jxw1899.blog.hexun.com/59011724_d.html)