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differing weights/sizes?

post #1 of 10
Thread Starter 

I'm 20 weeks 3 days today with di/di boys and 2 weeks ago I had the anatomy ultrasound. Everything is totally normal and great looking, with the additional information that Baby A is measuring ahead. Baby A is 20% larger than Baby B (who is right on schedule). Today at my appointment, the OB said that as an extra precaution, he's requesting an ultrasound every 4 weeks to keep track of how big Baby A is. (so, the next ultrasound will be in two weeks). He said not to worry about it because it's still early and they can even out, but he just wants to track it so we can have a plan (not sure what that plan would be).


Has anyone ever heard of twins where one is bigger than the other like this?


As a complete aside but I'm not sure if it would be helpful, my mom says my brother and I were a pound different at birth (she wasn't sure of our weights prior to birth).

post #2 of 10

That is a lot, but u/s have a margin of error.  Maybe the difference isn't actually so great.


But if your boys are di-di, and both growing well, that's just how they may be.  They're siblings, not MZ, not sharing resouces, and both have their own curves.


U/s every 4 weeks isn't too big of a deal, IMO.  That's what we had, and I always looked forward to seeing my little ones!


Keep up the good growing!

post #3 of 10

My twins have varied in weight throughout the pregnancy.  The little girl is always smaller, but she's still doing well.

post #4 of 10

My twins have gone back and forth by about 4-5 oz everytime we have had measurement ultrasounds. I think that if they OB isnt too worried about it, it's probably not that big of a deal. At my time before last ultrasound, A was  2 lbs 14 oz, and B was 2 lbs 8 oz. This time, A was 3 lbs 10 oz, and B was 3 lbs 14 oz.  They each have spurts at different times, and ultrasound isnt always right. 


DD was supposedly 4 lbs 14 oz 6 days before she was born at 6 lbs 8 oz. 

post #5 of 10

At my last u/s my OB really emphasized that all the measurements were just approximate. 

post #6 of 10
Thread Starter 

Thanks ladies! I am feeling more confident that my doc really does just want to keep an eye on things! I'll be interested to see what's going on at the next one on January 8. I actually have an ultrasound tonight to take pictures of the hearts (they weren't cooperating last time) so maybe they'll do other measurements, too.

post #7 of 10
Mine who are di/di as well and have actually been measuring within a day or two of each other all along so far and my OB is still wanting me to have extra ultrasounds at the end to watch their sizes, I'm 18 weeks now. I think most OBs just want to be extra careful with twins. And yeah, the further along you are, the greater the margin of error is in ultrasound measurements, towards the end +/-2lbs is pretty normal.
post #8 of 10

Yep! Mine are even mono-di and are measuring differently. According to ultrasound, my B is nearly a pound bigger than A. I was alarmed and concerned about TTTS, but my MFM assured me that A is growing normally and is the one who is on track for gestational age. My B has polyhydramnios (too much amniotic fluid) and it seems he's just a big guy! I'm going in every two weeks for now for ultraounds so they can monitor their growth, but then again, I'm 30 weeks. :) 


Sounds like you are getting great care! I know my MFM has said they are just doing every two week checks to be on the safe side. I know it makes me feel better, that's for sure!

post #9 of 10
Since they are di/di they probably aren't worried about TTTS. They might get concerned about iugr of the smaller twin, but if the smaller one is on track and the other is just large, I don't know why this work concern them. I had mono/di twins and was monitored bi-weekly, then weekly, then more frequently at the MFM. The ultrasounds estimates showed my baby B at as much as 8ozs difference at one point, but when they were born baby a was only 2 ozs larger. (8.4 and 8.2).
My friend had di/di twins at home a day before me and hers were off by more than 20%, but they were b/g (although she didnt know that at the time). Anyway, they were both totally fine and good sizes, just her baby a is a chunk wink1.gif
post #10 of 10

I had mono di twins Oct. 3 (3 weeks early).  Ultrasounds had shown A and B to be only a few ounces apart, but A ended up being a full pound more than B.  They had been monitoring me closely, as there was some blood-flow restriction in B's cord.  However, they both always performed well for NST's and biophysical profiles.  And even though B was so much smaller, she was and (knock on wood) is VERY healthy.  They were 4 lb 14 oz and 3 lb 14 oz, and no one had to go to the NICU.  Both have had some slight reflux issues, but that seems common in preemies. B is still a pound smaller, but but our pedi assures me that she should catch up by the time they are one year old.  She is lively and happy and very strong, and pretty much hits the milestones at the same time as A.  So as you can see, ultrasounds are often wrong in providing accurate measurements.  I'm sure all will be well for you.  :-)

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