6. Seek Fertility Assistance
Reproductive technology has dramatically increased the multiple birth rate. Drugs that stimualate ovulation can lead to a multiple pregnancy, but multiples can also result from invitro fertilization. It's not just that multiple embryos are implanted in the mother, but there is also an unexplained increase in the number of monozygotic twins among IVF patients. No ethical doctor would provide treatment if it wasn't warranted, so fertility assistance should only be sought out when necessary.
7. Have A Big Family
The more kids you have, the more likely you are to conceive twins in a subsequent pregnancy. No one knows the magic limit that triggers a multiple pregnancy, so you'll just have to keep trying until it happens.
8. Conceive While Breastfeeding
Most people think that you can't get pregnant while breastfeeding, that the process of lactating keeps a woman from ovulating. However, plenty of mothers of twins can disprove that theory. Some research has supported the theory that the chance of twins or multiples is increased if a woman conceives while breastfeeding.
9. Get Pregnant On the Pill
Birth control pills are usually thought to be 99.9 percent effective at preventing pregnancy. However, that .01 percent often results in a double whammy -- multiples. Sometimes pregnancy occurs when the pill isn't taken consistently; in other cases, the hormonal mix of a particular drug type simply doesn't provide enough coverage to completely prevent ovulation. In either case, playing around with hormones can lead to hyperovulation, increasing the chances of multiples.
10. Just Get Lucky!
Many parents of multiples don't meet any of the classic criteria, yet find themselves doubly blessed. Monozygotic twins are particularly mysterious; no one is exactly certain what causes an egg to split after conception, producing identical twins. The bottom line is that there truly isn't a whole lot an individual can do to influence their chances of having twins; sometimes you just get lucky!
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