Q: Are you having identical or fraternal twins?
This was one of our first questions too, and it is surprisingly difficult to answer. Since we only discovered there were two babies at 20 weeks, apparently we will never be totally sure unless we have a DNA test done on the babies after they are born.
What we do know is that the babies each have their own amniotic sac and what appears to be one fused placenta. This means they are likely fraternal (dizygotic), or formed from two fertilized eggs. This is the most common kind of twin pregnancy. We are happy with this news because it generally lessens the risks associated with being pregnant with multiples.
Identical twins (monozygotic), who form from one fertilized egg that splits, generally grow in one sac and share a placenta. This can lead to risks such as Twin to Twin Transfusion. But identical twins can sometimes have their own sacs and placentas if they separate in the very early days of conception.
Clear as mud? Suffice it to say, we think they are probably fraternal, but we are not totally sure!
Q: Do twins run in your family?
Twins are all throughout Mark’s family tree. Mark’s siblings are twins, his mother is one of two sets of twins in her family, and his cousins are twins. In my family, twins are a less frequent: I have second cousins who are twins, but that’s about it.
Fraternal twins can run in families, and identical twins don’t.
This is because fraternal twins come from “hyper-ovulation,” or the release of more than one egg in a cycle, which is a trait that can only be passed down from the mother’s family. So even though the twin gene runs strong in Mark’s family, it has no link to our pregnancy!
Hyper-ovulation can also be caused by advancing maternal age, and I am 34 years old. It can also just be a random occurrence!
Put simply, we won the baby lottery, because the chances of having twins are 1 in 67. How lucky are we?