Mothers of twins

[Ourbabies18]

I had a private scan 2 weeks ago where one baby measures 3 days behind the other she dates me from the younger twin was wandering if the same will happen at nhs scan or whether they go from bigger baby - i kno it doesnt rly matter just curious x

My NHS scan was dated based on the bigger twin. They were 3 or 4 days different at 12 weeks, but I'm now 24 weeks and they're equal size.

If you read the RCOG guidelines on dating multiple pregnancies, they state dating should be based on larger/largest foetus. The only deviation should be if you have had IVF and know conception/fertilisation date and how many days post fertilisation the transfer happened.

For a number of reasons I changed hospitals and one of the discrepancies was that they had dated me from LMP and small twin size when it was a donor egg cycle with confirmed ICSI date - the new hospital amended the 12 week scan dates back to what we expected.

The difference in dates was 2-3 days at 12 weeks. Now, at almost 32 weeks, we do still have a growth discordance which has been measuring between 19.1 - 29.6% at regular growth scans so the hospital see me fortnightly and scans me each time, they also measure liquor volumes and do Doppler studies to confirm the babies are not stressed or compromised by the situation. If the results suggest things are not going our way then they will consider early delivery.