The fetal heart usually changes with the weeks of pregnancy.
The fetal heartbeat is usually the heartbeat of the fetus as it develops in the uterus, and measurement of the fetal heartbeat during pregnancy can be a good indicator of fetal development. The frequency of the fetal heartbeat tends to vary with the week of pregnancy, but usually within a certain range and to a relatively low degree.
During the developmental stage of pregnancy, the frequency of fetal heartbeat will decrease, and due to the different physical and developmental conditions of individuals, the frequency of fetal heartbeat may also vary.
In general the fetal heart rate averages 162 beats per minute before 20 weeks of pregnancy, 147 beats per minute during the 21-30 weeks of pregnancy, and 139 beats per minute during the 31-40 weeks of pregnancy.
During pregnancy, you can judge whether the development of the fetus is normal or not according to the frequency of fetal heartbeat. If the fetal heart rate is less than 120 beats/minute or more than 160 beats/minute, you should go to the hospital in time to have a detailed examination of signs and symptoms, and judge according to the result and the doctor’s instruction.