There are many reasons why fetal movement decreases and becomes weaker in 32 weeks of pregnancy, such as umbilical cord around the neck, amniotic fluid decreases, intrauterine hypoxia and so on. 1. Umbilical cord around the neck: the umbilical cord around the neck of the fetus, can limit the emergence of fetal movement, which leads to the phenomenon of 32 weeks of pregnancy fetal movement decreased and become weak. Pregnant women can use ultrasound to clarify the situation. 2. Reduced amniotic fluid: rupture of the amniotic membrane, poor health, placental abnormalities can cause amniotic fluid to reduce, so the phenomenon of 32 weeks of pregnancy, fetal movement will be reduced and weakened. 3. Intrauterine hypoxia: low placental function, lower blood oxygen levels in pregnant women can lead to fetal hypoxia in the uterus, which can lead to the phenomenon of 32 weeks of pregnancy fetal movement decreased and weakened. There are many reasons for the decrease of fetal movement in 32 weeks of pregnancy, it is recommended to go to the hospital in time to improve the examination, timely monitoring of the fetal heart, a clear diagnosis, under the guidance of a professional doctor to take standardized treatment, not to ignore the symptoms, take it lightly.