At 96 days after menopause, the fetal biparietal diameter is about 24mm, femur length is about 14mm, head circumference is 89mm, and abdominal circumference is 75mm, and the details vary from person to person. If menstruation is regular and early pregnancy ultrasound is consistent with the number of days of menopause, 96 days of menopause, i.e., 13 weeks plus 5 days of pregnancy, the fetal biparietal diameter is about 24mm, femur length is about 14mm, head circumference is about 89mm, and the abdominal circumference is about 75mm. If menstruation is irregular or early pregnancy ultrasound does not correspond to the number of days of menopause, it is recommended that the obstetrician recalibrate the last menstrual period. Even early pregnancy ultrasound has individual differences, early pregnancy ultrasound and the actual menstruation can be allowed to exist within 5 days of the error, perfect ultrasound is recommended by a professional obstetrician to check the report, and determine whether it is normal.