One of my twins is measuring one week behind the other

One of my twins is measuring one week behind the other

by Cristy
(Colorado)

At my 13 week twin ultrasound, twin A measured a full week behind twin B. I am very worried about this.

I have a follow up ultrasound in 3 weeks. Is this common during a twin pregnancy?

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One of my twins is measuring one week behind the other

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Sep 10, 2011
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same issue
by: charlie

im 13 weeks to be exact and i had my original due date changed from March 12 to march 17 (my birthday) due to an unexpected twin! my one baby is measuring out to be 14 weeks and another is measuring out 13! im hoping it wont be an issue once i get MORE vitamins in me right?

Aug 02, 2011
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Are they identical twins?
by: Amy

I had exactly the same thing happen at my 13 wk scan, I was told I was having identical twins at this point. If they are identical, sharing a placenta can cause problems and my pregnancy was monitored very closely. The size difference did actually get bigger and by week 22 baby A was on the 50th centile and baby B was below the 0.4th, she was about the size of an 18 wk baby. My friend also had i.d twins and 1 baby was 1 week behind the other the whole way through her pregnancy, the size difference never increased with her babies. If they are fraternal however I wouldn't be worried as they will not be sharing the same placenta and will not share a blood supply (this can cause TTTS which my babies ended up getting). My babies are fine, 9 months old and there is still a difference in size. I know its hard not to worry but its out of your hands and the docs know what to look out for so unless theyre concerned I wouldn't be.

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