If we calculate the pregnancy week based on 4 weeks per month, 24 weeks of pregnancy means 6 months of pregnancy, but in reality, a month is mostly 30 or 31 days, so 24 weeks of pregnancy is actually less than 6 months. The pregnancy week is calculated according to the last menstrual period. When a woman with normal sexual life has a delayed period, she needs to consider the possibility of pregnancy, and at this time, the calculation of pregnancy is based on the time of the last menstrual period, if the menstrual cycle is regular and 28 days, the calculation of the pregnancy week is more accurate, and the expected date of delivery can also be calculated according to the last menstrual period. However, for some women with irregular menstrual cycles, the calculation of the gestational week may be slightly inaccurate, and an ultrasound examination is recommended to clarify the gestational week. When ultrasound indicates 24 weeks of pregnancy, it is usually around May to June. The 24th week of pregnancy is the middle of pregnancy, during which the pregnant woman should pay attention to strengthening nutrition and preventing pregnancy complications and other conditions. At this time, the screening ultrasound for malformations has been completed and attention is paid to the results of the screening ultrasound for any fetal structural abnormalities. In addition, a glucose tolerance test is required at this gestational week to exclude gestational diabetes.