At 18 weeks of pregnancy, the chances of the fetus stopping developing are relatively small, but there is a possibility that it may happen, so you should pay attention to the labor and delivery checkups on time. The risk of fetal arrest is higher in the 12th week of pregnancy due to the imperfect development of the embryo, and the connection between the embryo and the uterus is not yet stable, which is easily affected by various factors. Starting from 18 weeks of pregnancy, the development of the fetus gradually tends to be perfect and begins to show signs of fetal movement, at this time the chance of fetal arrest is relatively small. If fetal arrest at 18 weeks of pregnancy, it is often associated with umbilical cord placental abnormalities, endocrine disorders, uterine abnormalities, chromosomal abnormalities, reproductive tract infections and other factors. Fetal arrest leads to a decline in the levels of estrogen and progesterone in the body of the pregnant woman, and the body then has a rejection effect on the embryo, leading to vaginal bleeding with abdominal pain symptoms, and the fetal movement will also be reduced or disappeared. Therefore, if you experience any discomfort during the 18th week of pregnancy, you should consult a doctor in time to confirm the growth and development of the fetus through ultrasound examination, and to carry out symptomatic treatment in a timely manner. In your daily life, you should have regular checkups and learn to count the fetal movements, generally 3-5 times an hour is normal. Pay attention to rest, avoid overwork, increase activities and supplement nutrition, which are all conducive to the healthy growth of the fetus.