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Discussion Starter · #1 ·
A doctor I saw earlier in this pregnancy gave me the impression that since my twins are diamniotic and dichorionic, chances are slim that they are not dizygous (sp?) twins. Now, from some stuff I've been reading, I'm wondering if that's really true. Is there a chance they are "identical"? Does anyone who is already raising their twins think it's important to find out whether they are MZ or DZ at birth?<br><br>
Kiran
 

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Lots of monozygotic twins are have completely separate chorions and amnions. It is like doing a ultrasound to determine sex.<br>
IF you see a penis, it is definitely a boy. If you dont see a penis it MIGHT be a girl but it might be a boy in a difficult position to really see for sure.<br>
If you do see that they share the chorion or even amnion, it is definitely MZ twins. But if they dont see this they might be either.<br>
However keep in mind that only 25% of twins are MZ. And just having twins gives you a 75% chance of having fraternal. Now for whatever percentage of MZ twins which share a chorion, the remainder percent chance that it is MZ twins is smaller than even 25%. Does that make any sense?<br>
So it isnt at all impossible, but it is statistically a little less likely.<br><br>
Because my twins were DZ (and obviously so because they are b/g) I never had the issue of finding out "for sure"<br>
My sister also has twins that we presume are identical. But never saw a reason to know "for sure"<br>
I think if one twin developed a possibly genetic illness, that would be a good reason to find out for sure. But I dont know what else might make the list.<br><br>
Joline
 

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Mine are diamniotic and dichorionic and they are mz. We did the test to be sure just because we wanted to know. There is not much of a reason that you need to know unless one of them gets sick with cancer or something, but it is nice to know. Everyone asks and it is nice to able to tell them they are. I would have assumed that they were not mz because I don't think they look that much alike.
 

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<div>Originally Posted by <strong>johub</strong></div>
<div style="font-style:italic;">Because my twins were DZ (and obviously so because they are b/g)</div>
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Obvious to us - not everyone, right? How often do you mamas of BG multiples get asked if they are identical? <img alt="" class="inlineimg" src="http://www.mothering.com/discussions/images/smilies/lol.gif" style="border:0px solid;" title="lol"> My BBs are MZ identicals - and then I have my G triplet. People frequently ask if my G is identicals to my BBs? <img alt="" class="inlineimg" src="http://www.mothering.com/discussions/images/smilies/duh.gif" style="border:0px solid;" title="duh"><br><br>
I'm always gracious and just answer - "no - just my two boys" - but SHEESH!
 

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If your babes are same sex, it might be worth knowing if they are MZ or DZ for health and development reasons. If they are MZ, they should hit milestones near the same time, eventually be of similar size (although not always initially), etc. For example, if one twin is walking and the other isn't, it might not mean anything is they are DZ (who are like siblings, who can learn to walk at markedly different times.) But if they are MZ and one is walking and the other isn't showing signs, that might be a heads-up to check it out.<br><br>
I think I remember Elizabeth Noble's book saying if the the division of MZ twins occurs between days 1 and 4, you have two placentas (and that happens for about 1/3 of MZ twins). One placenta, one chorion and two amnions occurs if the split is between days 4 and 8, and one chorion and one amnion if the split is after day 8.
 

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Discussion Starter · #6 ·
Thanks for the information. I started thinking about this when I was reading about cord blood banking...and realized we could save a little money with MZ twins <img alt="" class="inlineimg" src="http://www.mothering.com/discussions/images/smilies/wink1.gif" style="border:0px solid;" title="wink1"> . But what the PP is saying about the odds lead me to think chances are pretty good they're DZ. Also, I felt when I was charting pre-conception that there was something weird and maybe I o'd twice...but then again they still <i>could</i> be MZ right? ACK! I guess we'll just wait and see!<br>
Kiran
 

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<div>Originally Posted by <strong>TripMom</strong></div>
<div style="font-style:italic;">Obvious to us - not everyone, right? How often do you mamas of BG multiples get asked if they are identical? <img alt="" class="inlineimg" src="http://www.mothering.com/discussions/images/smilies/lol.gif" style="border:0px solid;" title="lol"> My BBs are MZ identicals - and then I have my G triplet. People frequently ask if my G is identicals to my BBs? <img alt="" class="inlineimg" src="http://www.mothering.com/discussions/images/smilies/duh.gif" style="border:0px solid;" title="duh"><br><br>
I'm always gracious and just answer - "no - just my two boys" - but SHEESH!</div>
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LOL, people dont believe me when I tell them mine are even twins. How can they be twins? One is blonde with blue eyes and the other is brunette with brown eyes! People always ask me "How far apart are they?" and act shocked when I say "39 minutes". Or I will be out with all 3 and they will assume the boys are twins. Because they are both boys I guess. Never mind that Tristan is like 5 inches taller than Aidan.
 

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We sent cheek swabs to an online lab to find out if they were mz or dz. But it was mainly for our own information. And I'm not sure we would've done it if my parents hadn't offered to pay for it as a b-day present to dh <img alt="" class="inlineimg" src="http://www.mothering.com/discussions/images/smilies/smile.gif" style="border:0px solid;" title="smile"> My only reason for "needing" to know was to know how "at risk" we'd be for twins if we have more children (dz = high chance of more twins, mz = not so much) LOL. Of course, now dh is saying no way to more kids anyway so it doesn't matter, but we shall see what the future brings <img alt="" class="inlineimg" src="http://www.mothering.com/discussions/images/smilies/smile.gif" style="border:0px solid;" title="smile"><br><br>
And I would say that differences in size/milestones with mz twins would only be a sign of a problem if it's a DRASTIC difference. My kids (mz) have hit most milestones close together (& alternated who did what first) but Lexie walked a full month before Ashlyn, so they don't always hit milestones right together.<br><br>
Also my dad works w/ a man who is a mz twin & he said that all their lives (he's in his 50's now I think) he's been noticably heavier than his twin, so size differences are possible as well.
 

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My girls were diamniotic/dichorionic and we were told by two ultrasound techs and one OB that they had to be DZ. After doing some reading on my own I found out that it all depends on when the egg splits as to what MZ twins will share. The statistic is 25-33% of MZ twins are di/di. We first found out we were carrying both girls then had their blood typed at birth. If they would have had different types then we'd have know they were DZ. They shared the same blood type so we got their DNA tested. Sure enough they are MZ twins. I made copies of the test results and hand delivered them to the ultrasound techs as well as the OB who gave the bad advice in the beginning.
 

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I've read that about the splitting times, too, only iirc after a certain point (day 7?) the split will be incomplete and result in conjoined twins. The list I read was more broken down-- a)dichorionic/diamniotic, b) diamniotic/monochorionic, c)monochorionic/monoamniotic, d) mirror twins (identical twins who display heavy mirror imaging), e) conjoined twins.<br><br><br><div style="margin:20px;margin-top:5px;">
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<div>Originally Posted by <strong>sweetpeas</strong></div>
<div style="font-style:italic;">Also my dad works w/ a man who is a mz twin & he said that all their lives (he's in his 50's now I think) he's been noticably heavier than his twin, so size differences are possible as well.</div>
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From what I've read and twins I've met in real life, this is *extremely* common and results from milder cases of TTTTS. I've also seen MZ twins where neither seems much heavier than the other, but one twin will be noticeably taller-- like 4-8 inches taller-- than the other.
 

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I am new to this board.<br>
I've just been reading everyone's post and wondered how important is it to get a dna test done. I have twin girls and from what i was told at the hospital and with the u/s they said they had two sacs but one placenta. Which would make them dia/mono right? They are now two and a half and look alot different. One has long straight brown hair and deep brown eyes and the other has light brown wavy hair with brown with a little green inthe eyes. They are one pound different in weight and the same exact height. They've learned things within weeks of each other. So should i have them tested? Alot of other people say they can't tell them apart but I don't know how they can't. I also have read somewhere that they can be a percentage of identical. In that case, to me they look 70-80% identical. Anyways tell me what you think.<br>
mom to 2 boys and twin girls
 

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<div>Originally Posted by <strong>twinsr4me</strong></div>
<div style="font-style:italic;">I've just been reading everyone's post and wondered how important is it to get a dna test done. I have twin girls and from what i was told at the hospital and with the u/s they said they had two sacs but one placenta. Which would make them dia/mono right?</div>
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When was it determined that they had one placenta? My understanding is that it's very common for placentae to fuse during pregnancy, so if the assessment was made relatively late/after birth, they could have been looking at two placentae which fused rather than a single placenta which split. In other words, your girls could be dizygotic.
 

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A woman in th elevator yesterday asked me if my BG 4 yr old twins were indentical. "Mommy, what's indentical mean?" says DS. I explain, to which he tells the woman. "We're not indentical, I have a penis, Duh!!" My secret sentiments exactly. DS is also blonde and blue eyed, DD has light brown hair and hazel eyes....sigh
 

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I think it's up to you. Like some poeople mentioned, it would be nice to know if some thing came up in the future, genetic-wise. Or if you are someone who just 'has to know', (I am). If it were me and they looked very similar, I would probably do it.<br>
That said, our twins are IVF babies, and we transfered 2 embryos. So we were pretty certain they were fraternal. And they were listed as di/di on all of our ultrasounds. But, we knew there could be an outside chance that only one transfered embryo attached & split (into MZ twins) and the other one never attached---that wasn't the case, but it does happen. At any rate, our boys have the same blood type, both have blue eyes, but that is where the similarity ends. One has red hair, one is blonde. There is an obvious size difference. Currently, about 5 lbs and 2" difference. So, we are quite sure they are fraternal.
 

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I'm busting in here to say that if I could afford it I would test. I'm one of those have to know people. However, as I am only 10 weeks, we could find out that I have b/g and that would end all questions! LMAO!<br><br>
BTW, Hi Tracy!!!!
 

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Hi CK!<br><br><img alt="" class="inlineimg" src="http://www.mothering.com/discussions/images/smilies/love.gif" style="border:0px solid;" title="love">
 

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twins4me...hi! My very different fraternal boys appeared to share a placenta (it had fused we now know--because they are obviously fraternal). I have seen fraternal twins who look very id...<br>
I guess if it were me I would want to know (and if I were a twin girl I would definately want to know in the future--if your girls are fraternal they are more likely to have twins themselves but not so much if they are ID--plus I just think girls like to know those things!)
 
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