This document provides information about pregnancy, childbirth, and the postpartum period (puerperium). It defines pregnancy as the period when an offspring develops inside a woman, and can occur naturally or with assisted reproduction. The puerperium is defined as the 6-week period after delivery, as most changes from pregnancy and delivery resolve by then. The document also lists ICD-10 codes related to complications and conditions involving pregnancy, childbirth, and the puerperium.