8 months breastfeeding baby malnutrition harm is mainly affect the growth and development, serious cases can also cause damage to vital organs, need to be corrected in time. 1. affect the growth and development: 8 months baby is in the important stage of growth and development, malnutrition can cause the baby’s weight does not increase or decline, emaciation, poor mental health and so on. With the aggravation of the disease, its bone growth is slow, can also affect the height of the child. 2. Other: Malnutrition can cause many complications, including infections and nutritional anemia. In addition, severe malnutrition can also be accompanied by damage to the brain and other important organs. Breastfed babies at 8 months old should pay attention to scientific feeding and add complementary food in time. If malnutrition, it is recommended to consult a doctor in time for diagnosis and treatment.