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).