Oh god, there goes another Christmas.
The last time something like this happened (cutting back on the Baby Bonus) we (maternity hospital) had an absolute shit-tonne of "elective c-section for maternal reasons" in the week between Christmas and NY. Seriously, any mum over 35 weeks came in and tried to get their OB to induce/section them. With a corresponding spike in admissions to my NICU of babies who needed respiratory support because - surprise, surprise - they weren't fully developed yet.
I wish when they changed things like this they did it so the women who were already pregnant could claim it no matter what date they delivered, and the women who weren't yet pregnant got the "reduced" amount. Of course I wish they'd never reduce things like PPL, but that's never going to happen.