Fetal growth and development: The 25th week of pregnancy is about 6 months into the pregnancy. At this time, the fetus\’s body is becoming more mature than before. The weight of the fetus at this time is about 680 grams, and the length is about 34 centimeters. As the fetus develops, the proportions of the head and body gradually approach those of an adult. At this time, various organs of the fetus are basically mature, such as the lungs, which can begin to produce pulmonary surfactant, which is important for