The reason for the slow development of the fetus in the first six months is to find out the cause, which may be caused by maternal malnutrition, complications during pregnancy and abnormal fetal development, and to deal with it through supplemental nutrition, symptomatic treatment of the disease, and termination of pregnancy. 1. Maternal malnutrition: six months pregnant women are affected by dieting, excessive picky eating, gastrointestinal digestion and poor absorption and other factors, which may lead to maternal malnutrition, indirectly leading to slow development of the fetus, usually pay attention to balanced nutrition, small meals to supplement nutrition, eat foods rich in protein, vitamins, minerals and so on, in order to promote the normal growth and development of the fetus. 2. Complications during pregnancy: pregnancy anemia, gestational hypertension and other complications during pregnancy, such as more serious anemia in pregnancy, will lead to placental ischemia and hypoxia, affecting the normal development of the fetus in the womb, slow development of the performance of this situation should be directed at anemia to treat iron deficiency anemia can take iron, iron sulfate, iron protein succinate and other drugs treatment. 3. Fetal development abnormalities: six months fetal slow development may also be caused by fetal chromosomal abnormalities, amniocentesis examination shows chromosomal abnormalities, generally recommended to induce termination of pregnancy. Clinically, there are many reasons for the slow development of the six-month-old fetus, and the specific treatment should be examined and judged by the hospital.