Fetal heart rate of 159 beats/minute is normal, and the general fetal heart rate during pregnancy is between 110~160 beats/minute. When pregnant, between receiving external stimulating factors, generally will lead to changes in fetal heart rate, fetal heart rate more than 160 or less than 110 are fetal hypoxia, must be relieved by rest or oxygen under the guidance of the doctor. In the first 3 months of pregnancy fetal heart rate is relatively fast, but most will not exceed 160 beats per minute, the fetus is not too mature to appear such a situation do not worry, belong to the normal physiological; with the increase of gestational weeks, after 4 months of pregnancy the fetus is more mature, the fetal heart rate will be more stable, sustained between 110 to 160 beats per minute. Usually too much exercise, super physical activity, long time in a position, emotional fluctuations, etc. Fetal heart rate is easy to accelerate, physiological state after rest will slowly return to normal fetal heart rate. Pathological such as fetal hypoxia, umbilical cord compression and so on can also lead to rapid fetal heart rate. If the fetal heart rate continues to increase, it is recommended to go to the hospital in time for a clear diagnosis and standardized treatment, in order to prevent delays and serious consequences.