The size of a pregnant woman’s pelvis is usually not easy to see directly from the appearance, and there is no way to carry out self-measurement of the size, it is recommended that pregnant women go to the hospital on time for maternity checkups and professional measurements. Pelvic size of pregnant women should be measured in the hospital, the detection of pregnant women’s pelvic bone is divided into extra-pelvic measurements and intra-pelvic measurements, both need to be evaluated by a professional obstetrician. In the later stages of pregnancy, the obstetrician will usually formulate a birth plan for the pregnant woman based on her pelvis and the size and position of the fetus, so she does not have to worry too much about her pelvic bone size before delivery, and pregnant women with small pelvic bones can opt for a cesarean section. In order to have a smooth delivery of the fetus, you must arrange a good diet in the second trimester of pregnancy, eat more fresh vegetables and fruits, eat foods containing protein as appropriate, and control your weight so as not to make the fetus too big and not good for delivery.