Twelve weeks of IVF transplantation days are more than twelve weeks of IVF transplantation, and the head and hip length of the fetus in 12 weeks of IVF transplantation is about 4.8~7.0cm. However, due to the different nutritional status of each pregnant woman and the different hormone level status in the body, etc., there may be an impact on the growth and development of the fetus. So IVF transplantation 12 weeks, the specific size of the fetus varies from person to person, as long as it is within the range of normal values, it is mostly normal and does not require special treatment. At 12 weeks of pregnancy, all the organs of the fetus begin to develop, and the internal organs are also differentiated and complete, taking on the shape of a human being, so it is recommended to do a good job of obstetric examination on a regular basis. At the same time, pregnant women need to pay more attention to the balanced intake of nutrients, pay more attention to rest, avoid strenuous exercise, and promptly consult a doctor after the occurrence of symptoms of physical discomfort.