Fever, puerperal: Fever that lasts for more than 24 hours within the first 10 days after a woman has had a baby. Puerperal fever is due to an infection, most often of the placental site within the uterus. If the infection involves the bloodstream, it constitutes puerperal sepsis. Puerperal fever has gone by a number of different names including childbirth fever, childbed fever and postpartum fever. In Latin a "puerpera" is a woman in childbirth since "puer" means child and "parere" means to give birth. The puerperium is the time immediately after the delivery of a baby.