can identical twins have different gestational ages?
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It is inferred that superfecundation by the same man is relatively common and that therefore dizygotic twins quite often have different gestational ages.
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Yes! Identical twins came from the same sperm and egg, so they have the same chromosomes and genes. But there are environmental differences that can affect the way they look and behave. ... As identical twins get older they may look more and more different, because they are exposed to more diverse environments.
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Identical twins came from the same sperm and egg, so they have the same chromosomes and genes. ... So identical twins with identical DNA may have different genes turned on, causing them to look and act differently, and even to develop different diseases such as cancer.
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These single embryo transfers get high pregnancy rates, without a high chance of twins. Identical twins are slightly increased in IVF pregnancies. IUI and IVF also carry different chances of fraternal or identical twins. Fraternal twins occurs when two different eggs are fertilized by two different sperm.
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Studies have shown that identical twins do not start their first period at the same time or even the same age, and the differences in when they start their first period is about the same as the difference for non-identical twin sisters.
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Multiples do tend to be born smaller than single babies. But it's not because their growth rate is necessarily slower — in fact, for twins, it's about the same as any other baby's until about weeks 30 to 32, when they do slow down a tad, since they're competing more for nutrients.
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Twins are more likely to be born early, often before 38 weeks, so it's important to understand your birth options. Less than half of all twin pregnancies last beyond 37 weeks. Some hospitals have cots that allow your twins to sleep together.
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All pregnant women have the same chance of having identical twins: about 1 in 250. Identical twins do not run in families. ... older mothers are more likely to have non-identical twins because they're more likely to release more than 1 egg during ovulation.
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Twins are defined as children produced in the same pregnancy. Usually they are delivered only a few minutes or hours apart. But they can have different birthdays. ... Twins have been born days and even weeks apart!
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Having identical twins is not genetic. ... However, for a given pregnancy, only the mother's genetics matter. Fraternal twins happen when two eggs are simultaneously fertilized instead of just one. A father's genes can't make a woman release two eggs.
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The chances of having identical twins is relatively rare — around 3 or 4 in every 1,000 births. And while it may be obvious, identical twins are always the same sex, either both boys or both girls, at birth. Why? Well, they don't just look alike — they also share the exact same DNA.
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Identical or maternal twins normally develop socially at about the same speed. Fraternal or non-identical twins may develop slower or faster than the other, much like single birth children. ... As they grow older, each twin's individualism shines through.
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Women who are over age 30 — especially women in their late 30s — have a greater chance of having twins. That's because they're more likely to release more than one egg during ovulation than younger women. Mothers between ages 35 and 40 who already have given birth have an even higher chance of conceiving twins.
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In most cases, twins are born within minutes of each other. But if all goes well, two miracle babies in Washington State will be celebrating their birthdays a whopping four months apart. The unusual story began late last month, when the boys' mom, Holli Gorveatt, went into labor unexpectedly at 23 weeks.
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Identical twins may either have their own separate placentas or they may share a common placenta. ... Between four to eight days the MC twins will have separate sacs of water (diamnionic) despite a shared placenta, but after eight days they will also be in the same sac (monoamnionic).
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The chances of having identical twins is relatively rare — around 3 or 4 in every 1,000 births. And while it may be obvious, identical twins are always the same sex, either both boys or both girls, at birth.
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All pregnancies are different, of course, but generally twin pregnancies stand out from single pregnancies on a number of points. 1. First of all, you get bigger, faster. Ordinarily, at 4-5 months the belly of a mother pregnant with twins, is around the size of a the belly of a woman pregnant with one at 8-9 months.