1. The development of the fetus in three months of pregnancy. The fetus in three months of pregnancy has entered the embryonic stage, and various organs and tissues of the body have begun to gradually form. At this time, the fetus is approximately 7.6 cm in length and weighs approximately 14 grams. At this stage, the fetus\’s head is relatively large, taking up more than half of the body. Organs such as eyes, ears, nose, mouth, and teeth also begin to form, and the heart has