Usually fetal movement starts after 16 weeks of pregnancy and becomes more and more frequent as time increases. The 28th week of pregnancy is the stage of active fetal movement, so frequent fetal movement is more common and mostly normal. The normal frequency is 3-5 times / hour, if there is a short period of time abnormally higher than the value, suggesting that there may be abnormal conditions, but some babies also exist in the phenomenon of frequent fetal movement, fetal movement abnormalities, it is recommended to seek medical attention, if the fetal heart is normal, do not worry too much. A normal situation: 1, pregnant women factors: emotional excitement, exercise, may cause frequent fetal movement; 2, fetal factors: fetal habits may be different from pregnant women, the fetus may be active at night, and pregnant women are more at rest at night, the perception of fetal movement is more obvious, so it will be considered frequent fetal movement; 3, external factors: the fetus by external interference, such as noise, music, may interfere with the fetus sleep, or fetal response to external sounds, may cause frequent fetal movement. 2, abnormalities: 1, acute fetal intrauterine distress: due to the umbilical cord around the neck, placenta abruptio, contractions too strong, amniotic fluid too little, etc., may cause acute fetal intrauterine distress. When fetal movement is frequent, ultrasound is needed to confirm the diagnosis by measuring umbilical artery blood flow and fetal middle cerebral artery blood flow. If abnormalities are found and acute intrauterine distress is confirmed, intrauterine resuscitation is performed. The way often used is the left side of the pregnant woman, oxygen, intravenous rehydration if necessary; 2, intrauterine infection: 28 weeks of pregnancy, if the pregnant woman has a fever accompanied by frequent fetal movements, intrauterine infection may occur, timely monitoring to further identify the type of viral infection, and take appropriate treatment; 3, miscarriage: during pregnancy, if the fetal movement is too frequent, you should also pay attention to observe whether there is uterine If there is contraction of the uterus and severe pain in the abdomen, consider the signs of miscarriage and need to deal with it in time. At 28 weeks, the fetus has entered the perinatal period, and if an emergency occurs, the birth can be brought forward, and the fetus has the possibility of survival after birth. 28 weeks fetus weighs about 1kg and needs to be transferred to the neonatal ward after birth. In addition, due to the relatively small gestational age, various complications of prematurity may occur and parents should pay attention to monitoring and care.