Which decides twins

Women who have overweight or obesity also have a higher chance of conceiving twins naturally. Specifically, the chances are highest if your body mass index BMI is above 30, according to a study that looked at data from more than 51, births in the United States. A later study in that analyzed maternal characteristics among women in Norway said rates of twins increased among women with BMI above Having a BMI over 30 may also place you in the high-risk category of pregnancy, so talk to your doctor about a healthy weight for you before getting pregnant.

Black women deliver twins at a higher rate than white women, according to birth statistics in the United States. But Asian and Hispanic women deliver twins at a lower rate than the other groups.

This may occur because women who eat dairy may be taking in extra insulin growth factor. The cows release this hormone into their milk and — when consumed — it may influence human reproduction. And little research if any regarding dairy intake affecting twin birth rate has been completed since. He or she may be the reason you end up having twins.

A previous pregnancy — or, better yet, previous multiple pregnancies — may increase your chances of having twins. In fact, according to the , women between the ages of 35 to 40 with four or more children are three times more likely to have twins than a woman under 20 without children.

Clomiphene citrate Clomid and letrozole Femara are ovulation-stimulating medications. Both of these drugs are often given in IUI cycles and may help the body produce multiple eggs that may release at the same time.

If two or more are fertilized and implant, twins are a possibility. In one study , the rate of twins with Clomid was 7. Femara had a lower rate of just 3. Gonadotropins, like follicle stimulating hormone FSH , stimulate the growth of egg follicles. These injectable medications are also often used in IUI and other fertility treatments, and the rate of twins while using these medications is a whopping 30 percent. Drugs are also a part of IVF. But one of the main factors that increases your chances of twins with this reproductive technology is the number of embryos you decide to transfer.

Share on twitter Twitter. Share on linkedin LinkedIn. Share on email Email. Similar Post. Multiple Births. Multiples Pregnancy: Twins, Triplets and More A multiples pregnancy means having twins, triplets or multiples.

Is it Safe While Pregnant. Safe Exercise During a Multiples Pregnancy You have been told that you are expecting multiples and that you will need to gain more weight, eat more…. Recommended Reading. Exercising While Pregnant With Multiples. Picking Your Multiple Birth Team. Pregnant With Twins or Multiples. View Sources. National Institutes of Health, U. March American Academy of Pediatrics, Healthychildren. May No bedrest with twins.

How do you eat dinner with infant twins? There are 39, active discussions happening now in our Multiples and Twins community group. So that you can imagine that the genetic material in these two identical twins is identical to each other, hence the name.

The contrast to this would be fraternal twins, which are twins born at the same time. However, they are actually the result of fertilization of two different eggs, and thus can be different genders and look different, and have different characteristics.

What's becoming increasingly clear is even though we call identical twins identical, and we think of their genetic material as being identical, we need to be reminded that there are environmental influences that may change, actually, the characteristics of identical twins, reminding us, as we already know, that even though identical twins come from the same genetic material, in characteristics they may actually have differences as well.