24 weeks with twins. One smaller weight than the other. Very upset.

[Ella31]

Expecting identical twins , currently 24 weeks. Everything has gone well until today. Had my 3d/4d scan, heart fine, babies moving and no signs of anything wrong except the sonographer said that one twin is 1.6g in weight and the other is 1.11. This upset me as she was so vague and I'm worrying that my baby isn't thriving. It's not my normal sonographer either as this scan was an extra scan just to see their faces. I can't stop worrying.

That sounds normal with twins? Ones usually bigger than the other. If they aren't worried I don't think you need to be

Sounds normal for twins no?

Just seen this was a 4D scan... those scans arent diagnostic. We're they not measuring different weights before? I'd be shocked if not

I have identical twins. Are you scheduled
two weekly scans?

Whilst it is Norma for them to be different weights they need to monitor for TTTS. Are they MCDA and did the measure the amniotic fluid?

I am, seen every two weeks and no signs of TTTS today. Fluid was fine too. It was just the weight difference. 1.6 and 1.11. Yeah they are MCDA twins.

Hi there
Hope you are doing ok, I remember these worries so well myself.
I had MCDA twins in 2021 and remember my consultant saying that the risk of TTTS drops as the pregnancy progresses- you are doing so well!
Similarly I had scans where it would show one twin was slightly bigger than the other.
Eventually due to other complications (related to me- not the babies!) and because there were slight concerns that one baby was slightly bigger than the other I delivered by c section at 34 weeks.
Both weighed exactly the same and nearly 2 years on... they still do.
I hope this offers you some reassurance, I found some consultants are better at twin scans than others and unfortunately the bigger the babies get the harder it can be to measure accurately. Please do ask for a rescan if you are concerned. Xx

Also sorry to add- eventually my consultant told me not to have any scans with anyone but him as unfortunately the sonographers continually set alarm bells off by saying they couldn't see the membrane between the babies and because they were measuring things differently. Understandable as they are under time pressures and MCDA/MMDA twin pregnancies aren't an everyday occurrence.

It might be worth seeing if you can have one consultant who you see as you are a unique case and it may help with your worries.

That's good.

I don't want to scare you - I did have TTTS (DTs are 13 now) so I'm not sure if things have changed but a difference in size of over 20% needs to closely monitored and my maths puts the difference at over 20%.

If you have any breathlessness or your bump feels really hard you need to be seen by foetal medicine asap.

Hopefully it is just a difference in the two but I wanted to let you know what to look out for just in case.

Thank you so much, just hearing your experience helps. I see the same consultant all the time except for today - the 3d scan. The sonographer said she will inform my consultant and he will be onto me if he is concerned.