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Doctor insights on: Pregnancy Week By Week Identical Twins

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Need doctor's help! will identical twins be missed in 7 week ultrasound? 2013

Need doctor's help! will identical twins be missed in 7 week ultrasound? 2013

I Hope Not!: Twins at 7 weeks should be fairly clearly visible on a transvaginal sono. As far as whether or not they might be identical, that is a more difficult question to answer by sono and requires careful analysis of the membranes surrounding fetuses, unless there is a single sac which would only be seen in an identical twins (rare). They can also be in 2 sacs however. ...Read more

Dr. Milton Alvis Jr
4 doctors shared insights

Pregnancy (Definition)

When your due date arrives, you will be more than ready to have your baby! Most women deliver the baby somewhere between 37 and 42 weeks. According to the American College of Obstetricians and Gynecologists, only 5% of babies arrive on the exact due date. Approximately 7% of babies are not delivered by 42 weeks, and when that happens, it is referred to ...Read more


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Are fraternal or identical twins more common?

Are fraternal or identical twins more common?

Fraternal: More than 30% are monozygotic twins and nearly 70% are dizygotic. http://www.bjmg.edu.mk/record.asp?subrecordid=571 http://www.Sogc.Org/health/pregnancy-multiple_e.Asp. ...Read more

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Does identical twins have different sacs?

Does identical twins have different sacs?

Some do some don't: If two twins share the same sac, they're identical. (almost always works.) the pathologist who examines the placenta can tell. Identical twins can have two sacs, or one sac; if there are two sacs, there can be one or two chorions. Fraternal twins won't share chorions or sacs. ...Read more

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If you have identical twins, will they both develop the same genetic/inherited disease at the same point?

If you have identical twins, will they both develop the same genetic/inherited disease at the same point?

Depends: If it's something that fully expresses itself with no modification (such as huntington's), yes. If it's going to express itself but is lifestyle-modifiable (type ii diabetes), timing will differ. The diseases for which there's a genetic component (diabetes, lupus, multiple sclerosis, many others) have only one twin affected more often than not -- you can find details. ...Read more

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Can there be male and female identical twins?

Can there be male and female identical twins?

Identical twins: Identical twins are always the same sex. They have the same genetic endowment. Fraternal twins are siblings that were in utero together. Fraternal twins can be the same sex or the opposite sex. ...Read more

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How can identical twins be very different sizes?

How can identical twins be very different sizes?

Identical twins: Identical twins share a placenta. It certain circumstances the amount of placental blood flow to one twin may be more than to the other twin. That effects the growth of the twins. ...Read more

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What's the difference between fraternal and identical twins genes?

What's the difference between fraternal and identical twins genes?

Different, same.: Fraternal (dizygotic) twins share 50% of their genes, just like any other siblings. Identical (monozygotic) twins typically have the same 100% dna profile, as if clones of one another. ...Read more

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Do identical twins have the same fingerprint?

Do identical twins have the same fingerprint?

No: I understand that every person has unique finger prints. ...Read more

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Can identical twins have their menarche come at different times?

Can identical twins have their menarche come at different times?

Menarche: Yes. Just because they're identical genetically does not mean they'll do everything the same. Other factors contribute to puberty-timing, like weight gain. A bone-age x-ray can predict pubertal delay. ...Read more

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Do identical twins have the exact same DNA?

Do identical twins have the exact same DNA?

Yes: Identical twins start off with the exact same DNA. Small mutations can occur, so there might be slight differences that develop. ...Read more