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Old 04-29-2009, 12:17 AM
Bonnie Bonnie is offline
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Join Date: Jan 2009
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Quote:
Originally Posted by TexasRN
If the embryo splits before implantation into the uterine wall, there will be 2 placentas and 2 amniotic sacs. Fraternal twins ALWAYS have separate placentas and sacs but the placentas can grow together and look like one at delivery. So DNA testing is required to know 100 % for sure if the twins are same sex, look alike, and have the same blood type.


~Amy
Do they do DNA testing at birth for twins now to determine definitely which they are?
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