With advances in instrumentation, evaluation of fetal heart rate tracings c
an be combined with B-mode imaging to assess fetal activity and Doppler eva
luation of cardiac activity. These additional approaches will allow investi
gation into the fetal active and resting states, as well as the fetal respo
nses to acoustic and visual stimuli. Fetal motion analysis also demonstrate
s the scarce activity early in fetal life; fetal activity increases and mov
ements become quicker at later gestation. Evaluation of fetal movements in
addition to routine biophysical monitoring of fetal heart rate appears to b
e an attractive tool in the surveillance of fetal well-being.