We report a case of a newborn with unexpected severe anemia. A woman, at 38 5/7 weeks ofgestational age, presented with decreased fetal movement. A sinusoidal fetal heartbeat waveformand late deceleration pattern on fetal monitoring strengthened the decision for emergent Cesareansection. Using the frequency of fetal movement and the fetal heart monitoring pattern, together withdetecting fetal hemoglobin in maternal blood circulation by the Kleihauer-Betke test andhemoglobin electrophoresis, fetomaternal hemorrhage can be detected earlier and provide for betterfetal outcomes.