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Douglas Harper's Etymology Dictionary
post-partum

also postpartum, 1837, "occurring after birth," from Latin post partum "after birth," from post "after" (see post-) + accusative of partus "a bearing, a bringing forth," from partus, past participle of parere "to bring forth" (see pare). Phrase Post-partum depression first attested 1929.

Wiktionary
post-partum

a. Pertaining to the period immediately after childbirth. alt. Pertaining to the period immediately after childbirth.