The developmental characteristics of the embryo and fetus are generally described in terms of 4-week gestational age units. at the end of the 24th week, the fetus is about 30 cm in length, 21 cm in parietal length, and weighs about 630 g. At the end of the 24th week, near the end of the 25th week, the development of the two fetuses is more or less the same. At this time, all organs have developed, subcutaneous fat began to be deposited, because the amount of skin is not much wrinkled, the appearance of eyebrows and eyelashes, small bronchial tubes and alveoli have also developed. At this stage, pregnant women need to pay attention to a reasonable combination of meals, to ensure balanced nutrition, you can eat more food rich in protein and vitamins, and regularly do a good job in all aspects of pregnancy maternity examination.