Weight difference in monozygotic twins - Mothering Forums

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#1 of 1 Old 06-23-2009, 12:37 PM - Thread Starter
Gena 22's Avatar
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Be my birth detectives! Our family just found out that our twins are identical. I doubted it for a long time since they look different enough that I always know which is which, and they have had radically different personalities from day one. But we finally ordered a cheek swab test, and it came back MZ. Knowing that they share the same DNA has me wondering.

Here are the facts that I know: we discovered multiple gestation at our first u/s, 19 weeks. No prior signs. Had care through an OB and Maternal Fetal Medicine specialist through 37 weeks, after which I birthed at home with a fantastic midwife at 39 weeks. With a family history of dizygotic twins I assumed mine were too. Because I didn't want to know the sexes, I didn't get into discussions with my MFM doctors about zygocity. My pregnancy couldn't have gone better. Neither I nor my doctors had any cause for concern. Good fluid levels and good umbilical cords all along. U/S every four weeks.

At birth, Baby A weighed 6 lbs 11 oz and Baby B weighed 5 lbs 12 oz. They had their own amniotic sacs, but only one placenta came out.

What I'm trying to figure out is the cause and effect of the weight difference. It works out to be 14%, not the 20% which classifies as TTTS, but close in my mind. It didn't bother me when I thought they were fraternal - siblings can be different. But now that I know they are identical, I assume this means Baby B, Izzy, got less nutrients and Baby A, Belle, got more.

Is it likely that they shared a placenta? Wouldn't my docs have seen and been worried about that? I think it was originally two placentas which fused, as did our very experienced MW (over 43 sets of twins), although we couldn't tell for sure. If that's the case, did Izzy just have less space to grow? It's my theory that she was wedged under the placenta, because I felt her move much less (although she's mighty feisty now!)

Belle had vernex and Izzy didn't, does that mean Izzy had grown as much as she could and was ready to be out, while Belle wanted to grow a little more? (I used castor oil to kick start labor, another story.)

These aren't necessarily important questions. I have two beautiful girls, each individual and each developing well. And I'm lucky as a twin mom to have a full term home birth with no issues. But Izzy has never caught up to her sister in weight. At 16 months she's a tiny bit shorter and still a pound lighter. Just wondering what, if any, long term effects we can expect.

Thanks and sorry for the novel!

Mom to : Belle and Izzy
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