How in the world to they tell if babies are identical or fraternal while in the womb?
At my last ultrasound, they didn't tell me. AT my 6 week scan they said they look fraternal but it was to early to tell. I wish she had told me something today.
I have had a few people tell me they look like they are so close together and my be identical, but these aren't doctor's telling me
I think sometimes they can't tell for sure when they are in separate sacs. Obviously in the same sac they are identical. My doctor knew mine are fraternal because they could tell I ovulated from both ovaries (and was on Clomid). I've heard of situations, though, where they have to test them after birth to find out for sure.
The doc told me that if the embryo splits before the fourth day, they will form two sacks and two placentas. If they are the same sex, you can't be sure they are fraternal unless they do a genetic test when they are born or they look very different. The only way to know they are fraternal in the womb is if they are boy-girl.
I was told my boys were identical in m first scan I had (at 12 weks) as they were in one big sac, with a very thin membrane seperating them (so thin you could hardly see it) and were sharing a placenta. But as a previous poster mentioned, if an embryo splits really early, then identical twins can also have seperate sacs and placentas, so the only way you can tell 100% is through a dna test.
Hi - it is impossible to be absolutely certain of fraternals in the womb, but there are tell tale signs that make it more likely. Frats have a thicker membrane dividing them, and have seperate sacs/placentas. Because identicals can have these features too (albeit less often) you cannot be 100% certain until they're born - unless of course they are boy/girl as knitbit said. Mine were assumed frats all the way through, and that was confirmed at birth because they were so completely different to look at xxx
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