how do you know if your twins are identical or not ?

Jess - posted on 02/03/2010 ( 21 moms have responded )

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would like to know if my twin girls are identical ? they sared the same placenta and 2 different sacs .

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Jodi - posted on 02/03/2010

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SAME placenta = identical. Separate placenta can = EITHER identical or fraternal. There is no way a SINGLE placenta can BE fraternal twins, they can ONLY be identical. If twins are born in a separate placenta, THAT is when they ask if you want a DNA test to find out, but if they are born in the same placenta, it is not possible they were two separately fertilised eggs.

Jodi - posted on 02/03/2010

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Fraternal twins ALWAYS have a separate placenta. So if it is the same placenta, they MUST BE identical twins. It is still possible for them to share a placenta and have separate sacs. There is absolutely no way for fraternal twins to share a placenta. I am surprised your doctor didn't actually tell you this information.

Amanda - posted on 02/03/2010

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I'm a tad confused by the misinformation here on identical twins. First off the only time doctors are not sure when a twin is or isnt idenitcal is when there are two sacs with two placentas. They have found (thanks to DNA testing) that SOME same sex fraternal twins are actually identical. When twins share a placenta is it for sure they are identical no matter how many sacs the babies have. One placenta clearly means one egg, one sperm, the ONLY way to have identical twins. There has been many science advances about twins in the last few decades, doctors can now even tell you when your egg split into two. When your egg splits, decides if your twins, have one placenta, one sac, or one placenta, two sacs, or even two placentas, and two sacs (the only time when idenitcal is in question).



Twins with two sacs two placentas - split 1-3 days

Twins with two sacs one placenta - split 4-8 days (are always idenitcal twins)

Twins with one sac one placenta - split after 9 days (are always identical twins)





It doesnt matter what handed your twins are, identical twins can be different handed, as well faternal twins can be same handed. Faternal twins can look very much alike, just like identical.

Shakilah - posted on 12/11/2010

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a lot of people are confused, but my doctor didn't tell me either. The ultra sound tech told me they were identical, but at birth, things went so fast, when everything was calm and I asked my doctor, she had no idea. My daughters are 3 now. One is right handed and one is left handed. One has dimples like her father and the other has a mole on her face like me. When they went to the Dr. recently and had a physical, they scored the same exact results.

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I don't remember.... They tested mine to see if they were identical (they are), but that was 9 years ago and I haven't done any twin research since then. I believe as has been stated that one placenta defintely means identical, but I think you can also have a fused placenta which makes it harder to tell if it was one placenta or two.... which is where the testing comes in.

That is what I 'think' I remember, but could be way off.

Isobel - posted on 12/11/2010

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An ultrasound can tell if the twins are identical only when there's one sac. But identical twins can also be seen with two sacs and with one or two placentas. It really depends on how early the fertilized egg was split. The earlier, the more likely a doubling of everything, including placenta and sac. The later, the more likely the two babies will share a placenta or a sac.

But fraternal twins are two babies from two ovulations and two fertilizations--there must be two sacs and two placentas. So in summary, a set of identical twins may present with only one sac, or with doubling of everything; fraternal twins must have a doubling of everything.

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Identical

Sadie - posted on 02/03/2010

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i am a twin and identical to her we where from the same egg that split our birth mum was told if the twins are the same sex they have come from the same egg and are identcal and if they are different sex they are non identical

Whitney - posted on 02/03/2010

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The only sure fire way to find out if they are identical is to have a DNA test done. I was asked in the hospital if I wanted them to do it. And I asked does it really make a difference to their health in the long run. They told me no, it's mainly for curiousity. What I have noticed with my twins as they have gotten older, is that they are both allergic to penicillin, they both have ecemia, they both are right handed, etc. But they like different foods and like playing with different toys. They are two individuals that share the same DNA (I pretty sure, but who knows). I hope that helps.

[deleted account]

my twins were identical as one of the other ladies said they are monochorionic(means one placenta) diamniotic (two sacs) I am surprised it wasnt explained to you .Hope they are well

[deleted account]

Are they not suppused to be in different sacs as this is how you have conjoined twins?Its the placenta that can split at birth and thats when the confusion comes.

[deleted account]

Doesnt mean a thing as it can split.Twin grandaughters was the same way and it split.You can tell as time goes by. Join the twin club as my daughter did and participated in a survey and had the DNA done.Thats just a cotten swab in the mouth and sure enough Identical.Identical twins can be noticed right away.The tip off is ...when the two are together you can tell who is who it is when they are apart you have to study them to tell who is who. We knew right away the doctor was wrong as we could not tell them apart from day one!

Tait - posted on 02/03/2010

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I have the same case with my twins. They were supposed to check whether the placenta showed signs of being fused, meaning that it started out as two, then fused together.They never checked. But the twins had a case in which the one stole nutrients from the other, and that is only supposed to happen if they are identical. Nevertheless, their teeth are different, as one is missing the same wisdom teeth I am, and the other is missing the other two teeth I am missing! At fifteen years old, the two girls are trying very hard NOT to look alike, so that others will treat them as individuals.

Andrea - posted on 02/03/2010

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My twins were the same. They are called monochorionic diamniotic twins and yes, they are identical. I'm very surprised your doctor didn't tell you because they usually like to know what they are dealing with.

Jackie - posted on 02/03/2010

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Your twins ARE identical. The only way to have one placenta is to have only one egg. You aren't wrong for asking tho... with DNA testing we are now learning there can be two placentas and still be identical it is caused by a early split of the egg before they embed in the womb. These types of identical twins do need a DNA test to determine if they are identical or not.

Barbara - posted on 02/03/2010

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they come from the same egg. Ask your doctor. My mom had twin they are identical coming from the same egg. My grand daugther have twin coming from ths same egg. No they do not have to look alike. both are the same sex.

[deleted account]

same as jodi ...why werent you told thats crazy i mean we only do carry them for 40weeks and give birth to them lol.

Sue - posted on 02/03/2010

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I thinks they will prob be faturnal and not identical.... although I have a friend who thinks she has identical non identical twins and was thinking of getting a DNA test done. I'm pretty sure this is the only true way to find out, if they are identical they will have the same DNA?

Nina - posted on 02/03/2010

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Identical twins are formed when the egg is fertilized THEN splits to make two separate embryo. These embryo share a placenta.

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