Identical or Fraternal... how can you tell..or when did you find out?
I know this seems like a silly question. but... how did you find out if you were having fraternal or identical twins and how did they know?
I know that if they are in the same sac then they are autmatically identical.
I went to my last u/s and the tech said that it is possible for mine to be identical even though they are in seperate sacs. He said it was possible for the egg to have split so early on that the babies are in two sacs.
On my u/s the black space between the two isnt big like most ultrasounds i have seen. so i was wondering if anyone else has/had identical twins in seperate sacs?
We were told the same thing - although there was lots of room between the cells at six weeks (scan below)
We planned to get the boys tested if we were in doubt once they were born - tamba do one I think for about £80. However the boys had different colouring and by a few weeks old different colour eyes so that answered that question for us.
It is possible to have identicals that are in separate sacks AND separate placentas- if one egg split within the first 3 days. The only way to tell with these types of identicals is to either wait and see as they grow up or have a rather expensive dna test done.
Typically identicals share a placenta, sometimes with separate gestational sacks, sometimes with the same (although it's the scary one if they're in the same sack- LOTS of risk factors), and fraternals have separate placentas and obviously separate sacks.
If you watch the national geographic 'multiples in the womb' documentary it explains more - have bumped the link separately.
While the babies are still in the womb, the medical professionals need to treat pregnancies differently dependent on whether or not they are growing as:
DCDA - separate chorions and amnions (If you have 2 placentas will always be DCDA - normally fraternal but possibly identical. Can also have a fused placenta if positioned closely together)
MCDA - shared amnion but separate chorions (def identical).
DCDA - shared amnion and chorion - rare and much more risky (def identical).
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