Under normal circumstances, the fetal heart rate should be 120-60 beats per minute, which is a normal heart rate, and a heart rate of about 140 beats is within the normal range, so there is no need to be nervous about this situation. If the fetal heart rate increases after frequent fetal movements or uterine contractions, it can exceed 160 beats per minute at the earliest and cannot exceed 180 beats. If the fetal heart rate is below 180 beats/min, it is not necessary to be overly nervous if it can recover and improve after a little rest. If the fetal heart rate exceeds 180 beats/min and does not improve after rest, it means that the fetus has symptoms of intrauterine ischemia and hypoxia, and oxygen should be administered in time to improve the situation. If the heart rate does not improve after reaching the expected date of delivery with oxygen, the pregnancy should be terminated in time to avoid serious cases of intrauterine ischemia and hypoxic encephalopathy, which may lead to mental retardation or physical impairment after the baby is born.