A nurse is caring for a client during a nonstress test (NST). At the end of a 30-min period of observation, the nurse notes the following findings: The fetal heart rate baseline is 120/min with minimal variability and no accelerations. There are two decelerations of 15 /min in the fetal heart rate during a period of fetal movement, each lasting 20 seconds. Which of the following interpretations of these findings should the nurse make?