My OB has me on fortnightly scans and she seems to pay the most attention to the percentiles, and how much weight each has put on since the last scan. She doesn't seem to pay too much attention to the cord flow, or to the percentage difference between the two.
We've been lucky in that my little one has never fallen below the 10th percentile, although she has hovered around there for months. Also, the growth has been consistent, just slower than the other twin.
My OB has said that if she went down to the 5th percentile, or if her growth slows way down, then she'd want to think about delivering, especially since they are now both big enough to survive.
Sounds like your OB is taking a similar approach. Hopefully it won't come to that, but if he does recommend delivery at 34 weeks, your little boys will be pretty well cooked and I'm sure it would be for the best.
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