What causes low fetal heart rate in the second trimester of pregnancy?
Generally, fetal heart rates should be between approximately 110 and 160 beats per minute, although they can reach as high as 170 or 180 and as low as 100 and still be considered normal. The average will vary from baby to baby and will rise and fall throughout pregnancy. An unusually high or low fetal heartbeat can indicate a problem, in which an ultrasound may be needed.
