They are called silent contractions
Hi there. Congrats on being a new special 'auntie' to your friends baby.
Hm, well. Every woman is different. did she have an epidural which definitely cuts down on the pain. OR did she deliver really quickly? I've heard of some women having easy child birth. Not the case for me. But you kind of forget the hard part as you are so excited about the new baby.
so, I don't think it is common to have ZERO pain during child birth but lucky her, right?