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