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Is it possible to have twins with one sac?


Forum: May 2013 Playroom

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  • 1 Post By bcogoli
  • 1 Post By LPNMOMMY84

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  #1  
September 29th, 2012, 03:35 PM
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I feel like this is a really stupid question, but google isn't answering this question for me (in their defense, my search terms may be off because I'm dumb tonight). I had an external u/s at 8 weeks and only one gestational sac was visibile. I'm just curious if twins are even possible with one sac.
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  #2  
September 29th, 2012, 03:40 PM
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As far as i know yes it is possible, i think they are identical twins if they are in one sac and fraternal twins if they are in seperate sacs. I hope this helps. Are you hoping for twins?
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  #3  
September 29th, 2012, 03:47 PM
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Quote:
Originally Posted by bcogoli View Post
As far as i know yes it is possible, i think they are identical twins if they are in one sac and fraternal twins if they are in seperate sacs. I hope this helps. Are you hoping for twins?
Thanks! I just kind of have a feeling, and there are twins on my side of the family. I also feel like I'm showing a LOT more than most women at 9 weeks. But who knows! Lord knows I've been wrong before.
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  #4  
September 29th, 2012, 03:47 PM
LPNMOMMY84's Avatar Mega Super Mommy
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identical twins would share a sac I believe... could be wrong though
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  #5  
September 29th, 2012, 03:48 PM
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I also think typical twins typically share a sac
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  #6  
September 29th, 2012, 03:52 PM
LPNMOMMY84's Avatar Mega Super Mommy
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http://www.obgmanagement.com/pdf/190...M_Article1.pdf

The first page talks about the possibility of sharing a sac. I believe if they share a placenta, they would have shared a gestational sac. Where as fraternal twins develop from 2 eggs, so two gestational sacs I believe.

fetal development: 3 weeks pregnant | BabyCenter Philippines

this might help too
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  #7  
September 29th, 2012, 03:56 PM
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Quote:
Originally Posted by LPNMOMMY84 View Post
http://www.obgmanagement.com/pdf/190...M_Article1.pdf

The first page talks about the possibility of sharing a sac. I believe if they share a placenta, they would have shared a gestational sac. Where as fraternal twins develop from 2 eggs, so two gestational sacs I believe.

fetal development: 3 weeks pregnant | BabyCenter Philippines

this might help too
Thanks for posting these links! The latter explained it in a way that I could understand because I'm slow right now, haha.

So, basically, fraternal twins each have their own sac. Identical twins usually have separate sacs, but can share one sac in rare cases.

Sharing a sac is a higher risk, though...so I kind of hope we aren't having twins, then!

Last edited by mamamac; September 29th, 2012 at 04:00 PM.
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  #8  
September 29th, 2012, 04:13 PM
anothermother's Avatar Platinum Supermommy
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There may also be a possibility of not actually seeing both sacs this early. Sometimes they hide right behind each other and look like just one. I think that happened in my last DDC, where the first u/s only showed one sac, but the 2nd u/s showed two. Only time will tell though!
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  #9  
September 29th, 2012, 05:07 PM
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Actually, its fairly common to not see two separate sacs early on. (With identicals, which was already discussed!) We had our sonogram for our son at 7 weeks (6+6) and there were clearly two babies in one sac. The tech explained that there was probably a thin divide that we couldn't see yet and they would check when I was further along. But one twin did not have a strong heartbeat (strangely the more visible twin on the sonogram, Kieran was sorta balled up on the other side) and they would monitor me weekly to make sure they were growing at the same pace. The weaker heartbeat was gone by the next week and the baby started to dissolve.

But yeah, it's totally possible to have twins in one sac. BUT, did you see a baby at 8 weeks? I know most if the time they would see a twin at 8 weeks, even with just an abdominal sonogram. My second sonogram where the twin was dissolving, we saw a rather clear picture of both babies, even with one not forming anymore.
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  #10  
September 30th, 2012, 07:06 AM
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Originally Posted by ashj_1218 View Post
Actually, its fairly common to not see two separate sacs early on. (With identicals, which was already discussed!) We had our sonogram for our son at 7 weeks (6+6) and there were clearly two babies in one sac. The tech explained that there was probably a thin divide that we couldn't see yet and they would check when I was further along. But one twin did not have a strong heartbeat (strangely the more visible twin on the sonogram, Kieran was sorta balled up on the other side) and they would monitor me weekly to make sure they were growing at the same pace. The weaker heartbeat was gone by the next week and the baby started to dissolve.

But yeah, it's totally possible to have twins in one sac. BUT, did you see a baby at 8 weeks? I know most if the time they would see a twin at 8 weeks, even with just an abdominal sonogram. My second sonogram where the twin was dissolving, we saw a rather clear picture of both babies, even with one not forming anymore.
I'm sorry for your loss.

No baby in the u/s, but it was just an external u/s...so who knows. My bladder wasn't very full (even though I had a lot to drink), so that didn't help. I'm also a heavier gal. We'll get more info in mid-October. Thanks for all the info.
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  #11  
September 30th, 2012, 08:46 AM
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It's rare for identical twins to share a sac, like 1 percent. Also, I read that if twins run in the family, it is more likely fraternal twins, which always have 2 sacs. Identical twins is more of a random, chance event. It's fraternal twins that are hereditary.
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