Complete expulsion or extraction from the mother's system of product conception, irrespective of the duration of pregnancy.
From 1963 to the mid-1994, there were four categories of birth functioning in the medical practice and statistical reporting: live, still, non-viable with signs of life and non-viable without signs of life.
In July 1994, Poland introduced definitions of an infant birth and death consistent with recommendations of the World Health organization (WHO), i.e. there are two categories: live birth and stillbirth. The previous birth of an infant determined as non-viable with signs of life was reported as live birth and included into death statistics of infants at the same time. While the previous non-viable birth without signs of life was reported as stillbirth.