Civil Liability for the Wrongful Death of an Unborn Child; Revises definition of term "survivors" to include parents of unborn child; provides definition for term "unborn child"; prohibits right of action against mother for wrongful death of unborn child or against health care provider for lawful medical care provided in certain circumstances; authorizes parents of unborn child to recover certain damages; prohibits recovery of certain damages if decedent is unborn child.