Time period following childbirth when the mother's uterus shrinks and the other functional and anatomic changes of pregnancy are resolved

Wiktionary Word definitions in Wiktionary
n. (context obstetrics English) The period of time lasting around a month immediately following childbirth, when the mother’s uterus shrinks back to its prepartum state.

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
"confinement during and after childbirth," 1863, from Latin puerperus (see puerperal ).

WordNet Word definitions in WordNet
n. time period following childbirth when the mother's uterus shrinks and the other functional and anatomic changes of pregnancy are resolved; "a perinatologist cared for her during the puerperium"