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The Different Types Of Twin Pregnancies

Twins can be the same perspective, your chance of giving birth
(identical-monozygotic) or different to twins if you are less than 25 years of
(fraternal-dizygotic). Fraternal twins, age is less than half of what it would be
triplets, or more develop when two or after the age of 35.
more eggs are fertilized by separate 2. You are more likely to conceive twins
sperm. Fraternal fetuses have separate in the first few menstrual cycles after
placentas and amniotic sacs (the bag stopping birth control pills.
containing the fluid around a baby). 3. Infertility treatment. Fertility drugs
Identical twins come from a single egg stimulate your ovaries to release
that has been fertilized by one sperm. multiple eggs, which can be fertilized at
For unknown reasons, the fertilized egg once. This may result in a multiple
splits into two or more embryos during pregnancy. You are, therefore, more
the first stage of development. Some likely to have a multiple pregnancy if
identical twins share the same placenta. you use fertility drugs or assisted
However, they usually grow within reproductive technology (ART - In Vitro
separate amniotic sacs in the uterus. In Fertilization IVF).
rare cases, identical twins share one 4. ART is the transfer of embryos
amniotic sac (monoamniotic). directly into the uterus. In the early
Fraternal multiples: days, when success rates were extremely
1. Can be of different sexes and may have low, several embryos were transferred in
different blood types. the hope of achieving a pregnancy.
2. They may look very different from one Nowadays, 25% to 30% of pregnancies from
another, with different-coloured hair and ART are twins; 5% are triplets and less
eyes. They may also look alike, as than 1% are quadruplets or more. As
siblings often do. techniques have improved, success rates
3. Tend to run in families. from IVF/embryo transfer have increased
4. They are more common in older mothers, and reasonable success rates are being
African races and when there is a family achieved with single embryo transfer and
history of twins. They are least common this reduces the incidence of multiple
in Asian families. If you have already pregnancies.
carried fraternal twins, you have double What is the prevalence of multiple
the usual risk of having twins. A history pregnancy?
on your partner's side of the family does The natural incidence of twins is 1 in 80
not increase your risk of multiple pregnancies and for triplets 1 in 8000
pregnancy. pregnancies. The incidence is rising as a
Identical twins result of IVF and a tendency for women to
1. Are always the same sex and blood deliver later in their reproductive
type. years. Naturally occurring quadruplet
2. They do not necessarily look exactly births occur in 1 per 600,000 births. The
alike. One may be right-handed while the UK would, therefore, expect one set of
other is left-handed. naturally occurring quadruplets each
3. They develop at random. They are not year. There are estimated to be
related to maternal age, race, or family approximately 125 million human twins and
history of twins. triplets in the world, and just 10
4. Multiples that are conceived with million identical twins.
infertility treatment are usually One in two pregnancies with same sex
fraternal, rather than identical. babies are monozygous (identical twins).
What are the causes of multiple The rate of identical twins remains at
pregnancy? about 1 in 333 pregnancies across the
1. With increasing maternal age the globe.
chance of twins increases. To put it in




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