Table 1.

Definitions of Perinatal and Infant Mortality Indicators in Australia, Canada, Aotearoa/New Zealand, and the United States

Definition	Australia	Canada	New Zealand	United States
Infant mortality - death between the age of 0 and 364 days of life or death before 1 year of age	X	X	X	X
Neonatal death
- death between the age of 0 and 27 days of life.	X	X		X
- death between the age of 0 and 28 days (includes 28th day). Early neonatal death is that which occurs within the first seven days of life (including on the seventh day). Late neonatal death is that which occurs between the eighth day and the 28th day (including on the 28th day).			X
Postneonatal death
- death between the age of 28 and 364 days of life.	X	X		X
- death between 29th day and one year of age.			X
Fetal death
- synonymous with still birth.	X	X
- death of a fetus at ≥20 weeks, or weight ≥400 g if gestation is unknown, including stillbirth and pregnancy terminations.			X
- death of a fetus at ≥20 weeks, or weight ≥500 g if gestation is unknown, including stillbirth and pregnancy terminations.				X
Still birth
- death of a fetus at ≥20 weeks or birth weight ≥400 g, including terminations of pregnancy at ≥20 weeks of gestation.	X
- death of a fetus with a gestation ≥ 20 weeks, or birth weight ≥500 grams. The definition varies slightly in the province of Quebec where only the birth weight criterion applies (birth weight 3500 grams). Includes terminations of pregnancy.		X
- death of a fetus born at ≥20 weeks, weight ≥400 g if gestation is unknown. Excludes terminations of pregnancy.			X
- not a technical term. Used generally to refer to late fetal death (≥ 28 weeks or ≥ 1000 g).				X
Perinatal mortality rate
- Stillbirths and neonatal deaths per 1000 total babies born alive or born dead at ≥20 weeks, or weight ≥400 g if gestation is unknown.	X
- Fetal deaths and early neonatal deaths (during the first 7 days of life including day 7) per 1000 total at ≥20 weeks, or weight ≥500 g if gestation is unknown.		X
- Fetal deaths and early neonatal deaths (death during the first 7 days of life including day 7) per 1000 total births at ≥20 weeks, or weight ≥400 g if gestation is unknown.			X
- Fetal deaths and neonatal deaths per 1000 total births at ≥20 weeks, or weight ≥500 g if gestation is unknown.				X