yet another ID/FR Question..

Hey all! We had an amazing 4D ultrasound appointment today (I will post pics later!!) Got some great shots.. and the appointment was suppose to be 30 minutes but we were all having sooooo much fun it went on for an hour!! Wooohooo..

So my question is there were 2 placentas.. one anterior and one interior.. now doesn't that confirm that they are Frats?? Just wondering.. I know it is all about 1 egg or 2 eggs..

Ohhhhh yeah and heartbeats were at 133 and 140

 

I believe (but don't rely on my information) that even though their are two placentas, they could still be ID. I don't think it happens a ton like that, however, it's possible. Mine each had their own placenta and own sac, they are FRATS. We didn't do any DNA testing...they had different blood types at birth adn look NOTHING alike.

Can't wait to see the 4D pics...how neat!

 

In short, your twins could be either frat or id, so unless they are different genders, you'll have to test their DNA after birth!

Here's some info on identical twinning found on wikipedia:
QUOTE
When one egg is fertilized by one sperm cell, and then divides and separates, two identical cells will result. If the zygote splits very early (in the first 2 days after fertilization) they may develop separate placentas (chorion) and separate sacs (amnion). These are called dichorionic, diamniotic (or "di/di") twins, which occurs 20-30% of the time. Most of the time in identical twins the zygote will split after 2 days, resulting in a shared placenta, but two separate sacs. These are called monochorionic, diamniotic ("mono/di") twins.

In about 1% of identical twins the splitting occurs late enough to result in both a shared placenta and a shared sac called; monochorionic, monoamniotic ("mono/mono") twins.


Hth!
Jenny

 

My doc told me even with 2 placentas them being the same sex gives them a 25-30% chance they could still be identical! Like PP there is no way to really find out before they are born- they have to be tested. It all depends on when the egg split if there were one egg- if it split really late they still wouldn't share anything...

 

Yes, even with 2 placentas they still can be ID, if they are the same sex. If they are born with different blood types then they are frat, however if their blood types are the same they could be ID and you will want to get them tested then.

BTW-glad the u/s went so well. :clapping: Always nice to see the babies. Don't forget to post pictures.

 

My sister's twins each had their own placenta and sac, but they had the same blood type so they were told there was a 20-30% chance that they were identical. She had their DNA tested this summer and they are indeed identical...

 

I was wondering the same thing!

Not to hijack your thread, but mine have 2 placentas and sacs, and we just found out they are both girls. But, the peri is saying they're fraternal. Could this be because my first u/s only one sac showed (B turned up at the next u/s...and I was actually pg with trips, but lost one)? Baby B has been measuring a week behind all along. If they were identical, wouldn't they be measuring closer? Not that it matters, but I was curious.

 

QUOTE(Fireman @ Sep 28 2007, 02:04 PM) [snapback]427855[/snapback]
I was wondering the same thing!

Not to hijack your thread, but mine have 2 placentas and sacs, and we just found out they are both girls. But, the peri is saying they're fraternal. Could this be because my first u/s only one sac showed (B turned up at the next u/s...and I was actually pg with trips, but lost one)? Baby B has been measuring a week behind all along. If they were identical, wouldn't they be measuring closer? Not that it matters, but I was curious.


Identical twins don't grow at the same rate necessarily. They have identical genes, but there are differences between them. Off wikipedia:
QUOTE
Monozygotic twins generally look alike. Fine physical details such as fingerprints will differ. As they mature, identical twins often become less alike because of lifestyle choices or external influences.


My ID twins have always been different in size, due to placental and various other issues.

I don't think your peri can really confirm they are fraternals unless they are different genders (or diff blood types). Even if they were monitoring your embryos and eggs, they can always split early and implant separately.

hth
jenny

 

I had been told from very early on that my boys were frat because they had separate sacs and placentas, I was told there was no chance they were ID. Low and behold my boys are ID as ID can be.

 

Mom of identical twin boys here who had their own placentas -- one fundal posterior, one low-lying anterior. That's as far apart as is physically possible. Implantation sites not in close proximity does not mean they're fraternal. And yes, there are still doctors who are incorrectly telling their patients that two placentas = fraternal twins.

 

Actually there is still a chance that they could be Identical. Even if twins share nothing in the womb there is a more than 30% chance that they are ID. The only way to tell before they are born is to do an Amnio, which I wouldn't recommend unless medically necessary. Other than that you will need to wait until they are born. If they have different blood types then you know they are fraternal, it is a little hard to tell if newborns look exactly alike, but if they don't chances are they are fraternal, obviously if they are different sexes they are fraternal. If they share the same blood type you will have to do a DNA test to be sure.