This is my mom guilt, and purely anecdotal, but I think the high number of 2E is the result of twins being born early. I went to 37 1/2 weeks, but now I'm reading that's still "early."
My 2e son (singleton) was born at 37 1/2 weeks. It was a planned c section - his due date fell near a holiday so they pushed it back a little earlier (mostly because he was big - 8' 15" at birth, 2 1/2 weeks early).
Anyway. I've often wondered what a difference those last 2 1/2 weeks would have made... (other than letting him get even bigger - good grief)
