We consider birth as a physiological process within nature and that normally, in Spain, it usually happens in the hospital environment, so it becomes a controlled or at least observed process.

It is considered extra-hospital or urgent delivery to the one that occurs unexpectedly and has not been previously planned. It is considered an emergency due to the potential maternal-fetal complications, and having to assist it without the ideal conditions that a parlor provides. Childbirth is a physiological and natural event, which in the vast majority of cases our intervention will be limited to being mere "active spectators".

A bibliographic search of nursing scientific production has been carried out up to the present time in the following databases: Cuiden, Pubmed and Liliacs.