The fourth trimester of pregnancy is the four weeks from the beginning of the thirteenth trimester, when the enlarged uterus is already protruding from the abdomen and the pregnant woman’s abdomen is significantly enlarged. At the beginning of the fourth month, the height of the uterine fundus is between 2 and 3 fingers above the pubic symphysis; at the end of the fourth month, the height of the uterine fundus is between the belly button and the pubic symphysis. However, in terms of appearance, the size of the abdomen varies from one pregnant woman to another and cannot be generalized. Generally, women with a fat body type will have a more pronounced increase in abdomen. If you have a thin body type, the abdominal enlargement is not so obvious. Usually, in the fourth month of pregnancy, the standard uterine height of pregnant women is 16-20.5cm, abdominal circumference is 76-89cm, and the weight increases by 4-5kg, the fetus is about 12cm long and weighs 150g. Generally, in order to ensure the health of the fetus, pregnant mothers must measure the uterine height and abdominal circumference during maternity checkups to monitor its growth and development. In addition to the above abdominal appearance, pregnant women in the fourth trimester also have physical characteristics such as high energy, breast swelling, increased appetite, and susceptibility to indigestion and constipation. Some pregnant women may experience temporary memory loss and darkening of the skin, mostly in the darker areas such as freckles and birthmarks. These conditions are generally normal and do not require excessive worry.