I need help identical or ferternal

I have a question my girls are now 4 months old and we went to the dr yesterday and there is still and 50/50 on if they are identical or not as for they shared the same sake but they each had there own placenta's they both have the same birthmark and eye color and hair color and have to be next to each other all the time but to me they look nothing alike but everyone tells us all the time that they look alike. Im confused I think they are not identical.

 

I believe that if they shared the same sac they are identical.

Do you have a picture to share? I'm sure we could tell you!

 

I think all moms can see the subtle differenced even between ID twins. If they were in the same sac, it is likely they are ID. Along with the eye color, same birthmarks, and hair I would say its possible. Do you know their blood type? If they are different they are fraternal. You can order a DNA swab test. Several members here have done it and it was accurate.

 

I believe it is impossible for fraternal twins to share the same sac! There is your answer right there!

 

I think it would also be impossible to share a sac, yet have different placentas?? If they shared a chorionic sac, they would only have one placenta as far as I know. If their blood types are the same, maybe you could have DNA testing done?

 

quote:
I think it would also be impossible to share a sac, yet have different placentas??


Actually, that's not the case according to a book I have. It shows four different possibilities for monozygotic twins and one is separate placentas in a shared chorion. A shared amnion, however, would allow only one placenta.

 

quote:
Originally posted by debid:
quote:
I think it would also be impossible to share a sac, yet have different placentas??


Actually, that's not the case according to a book I have. It shows four different possibilities for monozygotic twins and one is separate placentas in a shared chorion. A shared amnion, however, would allow only one placenta.

So she had di/mono twins, interesting! Fraternals always have 2 sacs, because they are from 2 separate eggs. I do think you have your answer!

 

Same sack? Wouldnt that make them monoamniotic and there for be very high risk? My twins were thought to have shared the same sack until about 18 weeks. At that time they found a very thin membrane. Makbe there was athin membrane between the two that they didnt see.

 

I am 99.999999% positive it is impossible to have two placentas and one chorion. Which book did you read that in? I am really curious on this one -- if that book is right, it dispels everything I've ever been taught as an RN.

 

I was told by the peri. that our boys were fraternal because they had their own sacks.

 

QUOTE(2boysforus @ May 2 2007, 09:33 PM) [snapback]241666[/snapback]
I was told by the peri. that our boys were fraternal because they had their own sacks.

Identicals can have different sacs as well. It's a common misconception that 2 sacs means fraternal. I think it's like 33% of those with 2 sacs are still ID.

 

I think we need clarification as to WHAT sac they shared. The chorionic or the amniotic?

If they shared a chorionic sac then they would have only one placenta. This is what mine were (mono chorionic-diamniotic) and they are identical according to eveything I've read.

Merijo

 

QUOTE(2boysforus @ May 2 2007, 09:33 PM) [snapback]241666[/snapback]
I was told by the peri. that our boys were fraternal because they had their own sacks.


I was also told that my girls were frats b/c they had seperate sacs/placentas. Turns out through DNA testing that they are ID so having seperate sacs/placentas does not guarantee frats.

 

I have wondered about our girls too. I think we are going to just have the test done. My girls had seperate sacs and a fused placenta so the midwife told us they were fraternal. After talking to their pedi though it is pretty rare that they would have the same blood type (O+) when dh and I are completely different types (A+ and O-) so it was a 1/4 chance. And then you factor in that they had a twin to twin transfusion syndrome from the fused placenta and they are both female. He says for all of those things to be present and still have them be frat would mean I should play the lottery. Then again, I was told that even though every generation in my family had twins (Grandpa is a fraternal, Dad is an identical tested and true and I have identical brothers tested and true) the gentic counselor gave us a 5% chance. Maybe I should play the lotto.