[Fetal ethology].

The author summarises the main aspects of fetal activity and behavior. Fetal activity provides information about early stages of the neurodevelopmental processes. Fetal behavior offers an opportunity for the study of motor, sensory, and cognitive functions in the fetus and, thus, of fetal wellbeing. In high risk pregnancies, studies of fetal behavior may help to establish the optimal time for the delivery of the fetus.