The lack of weight gain in a 7-month-old baby may be caused by systemic diseases or zinc deficiency, improper feeding, etc. Babies who do not gain weight have recent illnesses such as respiratory infections, lung infections, gastrointestinal infections. During illness the baby’s diet drops poorly absorbed, which can easily lead to weight loss or no weight gain. If the baby has zinc deficiency leading to anorexia, then there will be a significant lack of intake, resulting in weight loss, there will also be a decline in resistance, etc.. 7 months baby complementary food add untimely, purely with milk powder or breast milk can no longer meet the needs of the baby’s growth and development, are easy to cause the baby’s weight does not increase, to improve the dietary structure in time. 7 months baby weight does not increase, there may also be other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.