How much does the vulva change after giving birth?

Now don't gang up on me, I KNOW they aren't supposed to look like porn star vulvas, I KNOW they're all beautiful✨ 
What I want to know is how much do they change? Does the labia get larger too? 😱 My waxing lady (not that it's any of her business) talks a lot. So one day while waxing my cousin who had a C-section she was going on about "Thank God you didn't have a normal birth, you should see some ladies who have, their bits are so stretched up and ruined...blah blah" So I'm just scared now 😖