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How often twins are born? The chances of having twins.

How often twins are born? The chances of having twins.Over the past 20 years, the number of multiple births has increased dramatically. This is largely due to the fact that now many couples decide to have a child later in life. 
Firstly, older women more often occurs multiple pregnancy than younger women. Secondly, and this factor is more significant, a pair of "aged" more likely to use drugs to increase fertility and procedures such as in vitro fertilization (IVF) to conceive a child. 

Approximately one third of twins - is identical, or monozygotic twins (when one fertilized egg divides into two halves). Two-thirds - non-identical or dizygotic twins (when the fertilized two eggs). The chances of getting pregnant female identical twins is 1: 250. The chances of getting pregnant nonidentical twins depend on your family history.

Multiple pregnancy while taking drugs for the treatment of infertility.

It was impossible to say with certainty, but be prepared for the fact that it could happen. Now most of the women who gave birth to twins, received a particular treatment. Only one treatment - intrauterine insemination (IUI), where sperm is injected into the uterus using a syringe - does not increase the risk of multiple pregnancy, unless you are in parallel with this are not taking drugs to enhance fertility. 

These drugs stimulate the ovaries, increasing the likelihood that simultaneously released more than one mature egg. 36% of women treated with polycystic ovary syndrome (PCOS), which uses the hormone gonadotropin, pregnant with twins or triplets. And about 13% of women who took the drug "clomiphene" and subsequently have multiple pregnancy. Latest technology infertility treatments such as intracytoplasmic sperm injection (ICSI), and the transfer of gametes into the fallopian tubes also increases the risk of multiple pregnancy. Since they, like IVF involve placement in the uterus or fallopian tubes of more than one embryo.

Among multiple births, which have arisen as a result of IVF, increased the number of identical twins. The reason for this is not entirely clear, but most twins, conceived in such a way - identical.

Chance of twins.

Your age is important. If you're over 30, then you are more likely to conceive twins than in younger women. As you get older, your body naturally begins to produce more hormones that stimulate ovulation, resulting in your ovaries may release more than one egg every month. Heredity - is also an important factor. The ability to conceive non-identical twins inherited, often, but not always, through the maternal line. If your mother's family were non-identical twins, have also increased the chances of conceiving twins. Chances are higher and some ethnic groups. The ability to conceive of identical twins (which is obtained by dividing a single fertilized egg) is not inherited. Size matters, too. One US study found that the number of non-identical twins born significantly greater among mothers whose body mass index (BMI) is 30 or more, or whose growth reaches the 25th percentile.


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