What exactly does covering childbirth mean? We've had two children now and it's not something I've considered when choosing insurance (my company's vs my wife's

What exactly does covering childbirth mean? We've had two children now and it's not something I've considered when choosing insurance (my company's vs my wife's), so maybe we just got lucky. Is there anything different about child birth vs simply in-network hospital coverage? I assumed we'd just hit our out-of-pocket max.