Does anyone know anything about fundal height with twins?

Question

I am 21 weeks pregnant with fraternal twin boys. I just had my first fundal height measurement and my dr said I'm measuring 30cm! To me that sounds huge! I did read online that the measurement is a cm for every week you are? Obviously twins you'll be bigger but I don't think my belly is that big! 
(Photo attached shows belly at 20 weeks)

Answer

You look fine! My doc said you basically measure 6 weeks more in general....
I'm now 24w and everybody thinks I'm going to deliver any minute now.

Answer

Don't worry! You look great. I have always measured well ahead. I am currently 35 weeks and measure 45 weeks.

Answer

In the book "When you're expecting twins, triplets, or quads" by Luke et al, they have a fundal height chart comparing singleton to multiple pregnancies. I'm not sure if it will display well here, but here's a pic of the chart.

Answer

You don't look overly big to me. I'm 24 weeks and look quite a bit bigger at least I think so, people tell me I don't look big for twins but I feel it. At my last appointment I was 20wks measuring 31wks you are going to be way ahead of those measurements you have two in there.

Answer

my midwife told me that twins measure 4-6 weeks ahead. I think you are fine. You look great!

Answer

That reading is different with twins than a singleton. 
You're fine ;)

Does anyone know anything about fundal height with twins?

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