The uterus gradually increases in size during pregnancy as the embryo develops. Therefore, as pregnancy progresses, the pregnant woman’s abdomen gradually increases in size. However, it is not normal for a pregnant woman’s abdomen to increase too quickly or too slowly. In general, the fetus develops at a normal rate, and the location of the uterine fundus in the sixth month of pregnancy is located one finger above the navel. At this time, the lower abdomen is bulging, while the upper abdomen is not significantly enlarged. However, in some special cases, the fundal position can be abnormal, resulting in abnormal abdominal appearance. When the fetus is delayed in intrauterine growth, this can result in a smaller than normal abdominal appearance. In the case of miscarriage, there can be a drop of the fetus and gestational tissues, which expel outside the uterus, and a smaller size of the uterus than the gestational weeks. Conversely, a number of factors can cause an abnormal increase in the size of the uterus. For example, when a pregnant woman has combined gestational diabetes, the fetus develops larger than normal, causing an abnormally large uterus. When the fetus is born with abnormal development, it can cause an increase in amniotic fluid, and the large amount of amniotic fluid in the uterus causes an increase in uterine volume. Therefore, it is essential to pay attention to the size of the abdomen in the sixth month of pregnancy. If you find that the volume of the abdomen does not correspond to the number of weeks of gestation, then it is advisable to consult a doctor promptly to rule out any abnormalities.