Eight-month-old babies who are too thin may be related to the inability to digest and absorb nutrients, and dietary adjustments are recommended. If the eight-month-old baby is breastfed, it is recommended to add formula and complementary food to the baby appropriately; if the baby is formula-fed, it is recommended to add complementary food to the baby appropriately. In addition, slowly cultivate the baby’s dietary habits, such as diet for the baby to eat more protein and trace elements rich food. Appropriate more activities with the baby, play, promote gastrointestinal motility, enhance appetite. In addition, if the baby is still losing weight after improving the diet, it is recommended to consider taking the baby to the hospital for a comprehensive examination to identify the cause and then follow the doctor’s instructions for targeted treatment.