Terms listed in Nguyen, R. and Wilcox, A. Terms in reproductive and perinatal epidemiology: perinatal terms. J Epidemiol Community Health 2005;59:1019-1021 


Perinatal period begins at 22 completed weeks (154 days) of gestation and ends 7 completed days after birth.

Early neonatal period is the first 7 days of life.

Immediate postnatal period is the first 24 hours of life.

Late neonatal period is the 3 weeks of life after the early neonatal period (8–28 days).

Neonatal period is the first 28 days of life.

Postnatal care is care for the mother and newborn as a unit during the first 6-week period following birth.[i]

Infant applies to children between the ages of 1 and 12 months (1–11 months)

Caretaker is an individual who has primary responsibility for the care of a child. Usually, it is the child’s mother, but it also could be his or her father, grandparent, older sibling, or other member of the community.

Maternal mortality is the death of a pregnant woman during her pregnancy or within 42 days of pregnancy termination, regardless of the duration of the pregnancy, from any cause related to the pregnancy or aggravated by it or its management, but it does not apply to death resulting from accidental or incidental causes. 


[i] WHO, 2010. WHO Technical Consultation on Postpartum and Postnatal Care. http://whqlibdoc.who.int/hq/2010/WHO_MPS_10.03_eng.pdf