Fetus eight months head big legs short, may be physiological factors or pathological factors caused by the need to deal with according to the weight of the fetus. 1. Weight is not small: if the expected weight of the fetus in late pregnancy is not light, there is usually no big problem in this case, and no special treatment can be considered. 2. Small weight: if the expected weight of the fetus in late pregnancy is more than 10% lighter than the average weight of the corresponding gestational week, this situation needs to be ruled out the possibility of fetal chromosomal abnormalities, if ruled out, it can generally be diagnosed as intrauterine growth retardation, which is easy to cause the head to be big and legs to be short. It is associated with placental insufficiency and requires close monitoring of fetal heart rate, amniotic fluid volume and umbilical cord blood flow, and if intrauterine hypoxia exists, the pregnancy needs to be terminated in a timely manner. In addition, it is necessary for pregnant women to actively participate in all periods of labor and delivery examinations during pregnancy, and to correct any problems once they are detected.