Yeah. I broke mine rollerblading when I was a kid. I didn't re break it during delivery, luckily, but it was definitely extremely painful for the first 48 hours after delivery. We had a hard time getting baby's head to pass through it.
Because you could rebreak/fracture it during delivery. Your chances of that happening after you have already had it break increase a lot. My cousin had it happen. She broke hers as a teenager and rebroke it during delivery. She said it was worse than the pain of the baby coming out.
Y is that?? I broke it years ago falling at a bowling alley I stepped on the lane and fell was drunk lol