Thirty-three weeks pregnant, the cause of fetal movement arc not much physiological factors and pathological factors, physiological may be related to the growth of the fetus, the uterine cavity activity space is limited, pathological factors are abnormal placental function, abnormal amniotic fluid, etc., need to be specifically analyzed. 1. Physiological factors, with the increase in months, the baby is growing up, the range of movement in the uterine cavity is reduced, there may be a phenomenon of fetal movement arc is not big, this situation is generally a normal physiological response, basically will not have an impact on the body, if the frequency of fetal movement is normal, generally do not have to deal with special. 2. Pathological factors, due to abnormal placental function, too much amniotic fluid, too little, etc. may have an impact on the fetus, resulting in slow fetal movement. At the same time during pregnancy gestational diabetes, high blood pressure or other diseases, may appear this symptom, need to consult a doctor in time to exclude the possibility of intrauterine distress. Thirty-three weeks of pregnancy with little arc of fetal movement is recommended to consult an obstetrician-gynecologist.