Fever in the first 24 hours after delivery often resolves spontaneously and cannot be explained by an identifiable infection.(1), (2) The causes of such single-day fevers are unknown, but it has been speculated that they are related to dehydration, lochia block, infusion of fetal protein, or breast engorgement.(3), (4) After performing a MEDLINE search (1966 to present) using the terms "puerperal disorders," "fever," and "
puerperal infection," we found only two studies addressing single-day fever.(1), (2) Little is known about the clinical factors associated with such fevers.