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Fetal Bradycardia in Response to Maternal Hypothermia. BACKGROUND: Fetal tachycardia can occur with maternal fever (hyperthermia); therefore, a low maternal temperature (hypothermia) might produce fetal bradycardia. CASES: Five cases of fetal bradycardia are presented in gestations complicated by maternal hypothermia. The fetal heart rate (FHR) tracings demonstrated stable baselines of 88-96 beats per minute with moderate variability and accelerations. All baselines returned to normal after maternal warming measures. CONCLUSION: A possible cause for fetal bradycardia with a stable baseline and moderate variability is maternal hypothermia, a pattern not indicative of fetal hypoxia. Delivery is not indicated, and maternal warming results in FHR baseline normalization.