29 weeks fetal movement suddenly less may be physiological phenomenon, may also be the occurrence of fetal distress and other pathological conditions. 1. Physiological phenomenon: fetal movement refers to fetal body movement, generally in 20 weeks of gestation can be conscious of fetal movement, after 28 weeks of gestation to fetal movement counting, normal fetal movement is ≥ 10 times / 2 hours, when the fetal movement is <10 times / 2 hours or 50% reduction is a decrease in fetal movement, when in the fetal sleep cycle will also be a decrease in fetal movement, this is a normal physiological phenomenon. 2. Fetal distress: When fetal movement suddenly decreases in 29 weeks of pregnancy and does not improve after appropriate stimulation, it is necessary to be alert to the possibility of fetal hypoxia, and it is necessary to go to the hospital for ultrasonography, umbilical cord blood flow and fetal biophysical scoring, and fetal cardiac monitoring to assess the intrauterine situation of the fetus. When there is a sudden decrease in fetal movement in the 29th week of pregnancy, it is necessary to go to the hospital in time to find out the cause and deal with it actively.