Why does childbirth still hurt?

I am wondering the following: In Genesis, 3.16, it is quite clear that God multiplies the pain of childbirth, in order to punish Eve (and all women) for eating the forbidden fruit. So, yes, this explains that childbirth is a punishment for this sin Eve committed. But then, Jesus dies for all sins of mankind, that is, all sins are forgiven. He revoked a bunch of other stuff in the old testament (thou shall not eat shrimp). However, if all sins are forgiven, why does childbirth still cause a lot of pain? Did Jesus forget this detail. Or is there another explanation?