Fetal heart ultrasound when the baby does not cooperate, pregnant mothers can change the position, appropriate exercise, eat food, fetal education and other methods to make the fetus activity, to find the best observation position. If the face of the fetus is facing the abdomen of the pregnant woman, it is more favorable for heart observation and facial observation at this time. If the position of the fetus is slightly unsatisfactory, the pregnant mother can be asked to turn over several times, alternating side lying position and flat lying position for examination. If the face of the fetus is facing the back of the pregnant woman, the observation of the heart and maxillofacial organs will be affected at this time, and it is difficult to change the position and posture of the fetus by small displacement changes of the pregnant mother. It is recommended that pregnant mothers appropriate exercise, you can walk in the corridor, climb stairs, etc., through appropriate activities to allow the fetus to change position, conducive to the doctor’s observation. In addition, pregnant mothers can also eat some food to stimulate fetal activity, or take some fetal education methods, such as mothers gently stroking the belly with their hands, listen to music, so that the fetus is gradually quiet after the four-dimensional ultrasound examination.