The normal range of placenta thickness is between 2-4cm in 23 weeks of pregnancy, generally the placenta thickness should be thick first and then thin, the placenta will gradually mature as pregnancy progresses. The nutrients needed for fetal development are obtained through the placenta, so the good or bad function of the placenta directly affects the health of the fetus. Pregnant women should be alert to problems such as placental insufficiency on a daily basis to avoid causing fetal malnutrition or fetal hypoxia. During pregnancy, the placenta of some pregnant women may have abnormalities, manifested as placenta too thick or placenta too thin. Usually the thin placenta is prone to bleeding and needs to be checked at the hospital; while the thick placenta needs to be alerted to the abnormal growth of the fetus in the uterus, because at this time the pregnant woman is prone to placental abruption and early maturation calcification of the placenta, which can cause intrauterine oxygen deprivation in the fetus. Pregnant women should pay attention to regular maternity checkups to monitor the intrauterine condition of the fetus and terminate the pregnancy in time if the fetus is in danger. At the same time, regular ultrasound examinations are recommended to monitor the placenta and to take timely measures to ensure the health of the fetus and the mother once abnormalities are detected. In daily life, pregnant women should pay attention to nutrition in the middle and late stages of pregnancy, eat foods with high protein content, such as eggs, fish and shrimp, milk, etc.; eat more fruits and vegetables, pay attention not to eat cold and spicy foods, and have balanced nutrition; and have regular pregnancy checkups to observe the development of the fetus.