Fetal development and picture introduction at 12 weeks. At 12 weeks of conception, the fetus has grown into a small life, with more obvious signs and characteristics than before. The following will introduce the development of the fetus during the twelve weeks from four aspects, with vivid pictures for better understanding. Physically, at twelve weeks, the fetus\’s body is more complete than before. At this time, the fetus is about 5.5cm long and weighs only about 14 grams. As the body grows, the positions of the eyes and ears begin to become closer, and the shapes of the nose and mouth become more