40 weeks frequent fetal movement may be physiological fetal movement increase, aura of imminent labor, may also be fetal hypoxia, placental abruption and other reasons. 1. Physiological increase in fetal movement: at 40 weeks, the development of the fetus is more complete, in the external stimuli such as loud sounds, pregnant women in a tense mood, the fetus may appear physiological increase in fetal movement, after the removal of these stimuli, fetal movement may return to normal. 2. Prolonged labor: 40 weeks of pregnancy has reached full term, frequent fetal movement may be a sign of prolonged labor. In addition, the pregnant woman will also have a sense of the fetus falling and the redness of the manifestation. 3. Fetal hypoxia: If the fetus at 40 weeks is suffering from hypoxia due to placental factors or other reasons, frequent fetal movements will occur in the early stage, and if the hypoxia situation continues without improvement, the frequency of fetal movements may decrease. 4. Placental abruption: If a 40-week pregnant woman finds that the fetus moves frequently, especially after experiencing strenuous activities or abdominal impact, she needs to consider the occurrence of placental abruption. If a pregnant woman in her 40th week of pregnancy experiences frequent fetal movements, it may be due to other reasons besides impending labor, and it is recommended that she go to the hospital in time.