One twin weight smaller than other at 24 weeks. Very worried.

[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

Not unusual at all to be different weights. Mention it to the MW next time.

I'm currently 31weeks pregnant with twins and they have weighed differently throughout. I'm never sure how accurate the weights given at scans are - you hear of so many people who are told they are having big 10lb+ babies who have smaller babies in reality.

Have you seen a consultant yet? I found once we started having regular growth scans and discussions with the consultant that helped put my mind at rest, but your midwife should be able to help in the meantime.

Apparently they don't get too worried unless there is more than 20% difference in size and they stop following their growth lines.

I'm in Ireland so I'm scanned every 2 weeks and I see a midwife before my doctor. Today was just a 3d/4d scan.

Am I right in thinking the difference weight between 1.6 and 1.11 is 20 percent.

I'm just annoyed the sonographer wouldn't reassure me.

Even if one baby is 1.6 and the other is 1.11?

I was sectioned early with my twins because they were worried that twin one was small and not growing. When my DD (twin 1) was born she was 6lb 60z! My DS was 5lb 10oz and they never raised any concerns with his size/weight. So just keep in mind that these weights aren't always accurate

That’s fine. Same as some singleton babies weigh 6lb born and some 10lb

It’s quite unusual for twins to be exact same weight I think. Most I know born we’re at least 1lb different ie one 5lb one 6lb3

Thank you so much for all your responses.

The scans can be wildly out too. I had multiple growth scans because DC2 was small. She arrived and was 8lb3oz.

perinatology.com/calculators/Twin%20Discordance.htm

You can work out the % difference there. But weight estimations can be quite far off. Would ask about it at your next appointment, but would try not to worry.

You said today was just a 3d/4d scan. Was that a private scan? If so, perhaps the weights the hospital estimated were closer together, hence why they haven't mentioned anything? If you carry your hospital notes, you should be able to see what they estimated at previous scans

Agree that the weights can be very inaccurate at scans - at 36 weeks I was told my twins were both measuring at 6lb, they arrived a week later and one was 6lb but the other only 4.5lb! So that was a 25% difference that they hadn't picked up on, but Twin 1's small size hadn't meant she wasn't thriving - she didn't need any medical help with breathing or feeding or anything, and both were discharged from hospital the same day I was. They're 4 now and only 1cm difference between them these days.