The third trimester of pregnancy usually fails to perceive fetal movement, usually around 20 weeks of pregnancy can be perceived slight fetal movement, transient mothers earlier than primigravida. Pregnancy is usually around 20 weeks of pregnancy can be conscious of slight fetal movement, with the increase of gestational weeks of fetal movement gradually enhanced, about 32 ~ 34 weeks of pregnancy to reach the peak, 38 weeks after the gradual reduction of fetal movement, the most active at night and in the afternoon; the position of the fetal movement and the height of the uterine fundus is related to the uterine fundus to the upper edge of the pubic symphysis can be sensed fetal movement, and the third trimester of pregnancy is not yet able to perceive the movement of the fetus. Fetal movement is an important signal during pregnancy to indicate the presence of intrauterine hypoxia of the fetus, it is generally recommended that after 28 weeks to regularly count the fetal movement, the number of normal fetal movement every two hours should be ≧ 10 times during pregnancy, such as fetal movement more frequent than the previous or reduced, should be timely hospital consultation.