There are individualized differences in how big the belly is in the 5th month of pregnancy. The height of the uterine fundus in the 5th month of pregnancy is usually at the level of the belly button, or at the position of one horizontal finger below the belly button of the pregnant woman, and more obvious and regular fetal movements can be felt. Due to the different pelvic width and body shape of pregnant women, there is usually no specific value for how big the belly is in 5 months of pregnancy. However, at this time the pregnant belly is already more obvious, the average abdominal circumference of pregnant mothers may be around 76 to 89 centimeters, the amount of amniotic fluid is about 400 milliliters, the uterine height is about 16 to 20 centimeters. When you are 5 months pregnant, you should pay attention to a balanced diet, supplement foods rich in calcium, minerals, proteins, vitamins, and eat more fresh vegetables and fruits. Regular checkups should be conducted, and you should seek prompt medical attention if you feel unwell.