dehydration fever

thirst fe·ver

an elevation of temperature in infants after reduction of fluid intake, diarrhea, or vomiting; probably caused by reduced available body water, with reduced heat loss by evaporation; an analogous condition in adults is seen when exertion is continued in the face of dehydration.
Farlex Partner Medical Dictionary © Farlex 2012

dehydration fever

Neonatology An ↑ temperature in a neonate due to inadequate fluid intake, most severe in high ambient temperatures or when the infant is overclothed. Cf Prickly heat.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.