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The earlier scans are the most accurate for dating purposes. I believe ACOG guidelines currently recommend 39 weeks as the earliest for elective induction/scheduled csection unless there is a medical indication to do it earlier.

I guess embrace the fact that you know already what your LO's birthday will be?

My OB bases the date in the ultrasound done around 8 weeks. It doesn't change after that. I don't see why it would. To me measuring ahead means a bigger baby, not an older baby.

Eta: At my hospital elective c sections can only be down starting at 39 weeks. Anything earlier would require it to be medically necessary. For me that happened because of low amniotic fluid.

They never wiggled for me. I'm trying to push back my section date because I'm totally unsure of my dates but they are sticking to the dating scan due date.

Good luck.

@Mamasig: same here. They had me wait until 39w4d for #2 even though #1 was over ten pounds.

If your doc is focused on improving their care quality they will not offer an elective delivery before 39 weeks and that is a good thing!!! Physicians are being asked to report on this quality measure for payment incentives and public c reporting initiatives, so you're probably not going to be able to persuade them to change it. Babies born electively before 39 weeks are more likely to need more intensive care. 37 weeks is now considered early term not full term like it used to be.

I've never heard of docs changing due dates after the initial dating scan, since the first 12 weeks give the most accurate due date.

They wouldn't change it with my first even though I know they were at least 3 days off! I got my BFP at 9 dpo, so there was no way I'd have gotten my positive at 6 dpo. I was very confident in my dates because I had been charting, too. At the first ultrasound, I measured 6w1d when I should have been 6w4d. At every ultrasound after that, I measured at least 4 days AHEAD of my own dates and they still wouldn't change it.

I had him at 39w1d (by their dates) and he was almost 9 lbs.

My OB bases the date on the 7-8 week ultrasound, unless the baby is measuring significantly off by 5+ days. Then my OB would do another scan at 11-12 weeks and based on the two scans decide. It doesn't change after that.

My radiologist legit argued with me about my due date after my 20 week scan. The baby consistently measures dead on against my LMP, but I have long cycles and I know when I ovulated and my RE and midwives gave me a later due date - the baby is just a little bit big. This radiologist was so insistent about it being WRONG, and I eventually just told him to take it up with my midwives, who were basically just like "shut up."