A thirty-week-old fetus has a biparietal diameter of about 7.5cm, a femur length of about 5.cm, an abdominal circumference of about 25.8cm, and a weight of about 1500g. Strictly on-time and standardized obstetric examination during pregnancy will enable early detection of pregnancy complications or fetal abnormalities and timely intervention and treatment. Fetal biparietal diameter, femur length and abdominal circumference should also be monitored by ultrasound to assess fetal growth and development. At 30 weeks of pregnancy, the fetal biparietal diameter is about 7.5cm, femur length is about 5.8cm, abdominal circumference is about 25.8cm, and weight is about 1500g. Since the mid-pregnancy, you should increase the amount of food containing protein, iron, calcium, vitamins and other nutrients, such as dairy products, meat, fish, eggs, fresh vegetables and fruits under the guidance of your doctor, in order to satisfy the needs of the growth and development of the fetus. During pregnancy, you should also maintain an appropriate amount of physical exercise to keep your body weight growing appropriately during pregnancy, which is conducive to natural delivery.