30 weeks pregnant in the middle of the night fetal movement is regular and strong may be normal, fetal movement irregular and strong may not be normal. 30 weeks pregnant fetus in the uterus range of motion is relatively large, intrauterine amniotic fluid volume is sufficient, the number of fetal movements will gradually increase, the middle of the night pregnant women sleeping fetus is not necessarily sleeping, fetal activity in the uterus will produce fetal movement, pregnant women in a quiet state may feel the fetal movement is more powerful, the regularity of the fetal movement belongs to the normal phenomenon. Fetal movement in the 30th week of pregnancy may also be a manifestation of intrauterine hypoxia of the fetus, which may be caused by umbilical cord around the neck, umbilical cord kinking, abnormal placental function, etc. Fetal movement at this time of frequent movement is generally not regular, belonging to the phenomenon of abnormality. Pregnant women who feel abnormal fetal movement can go to the hospital to do ultrasound, fetal heart monitoring examination, appropriate oxygen to improve the symptoms.