Infants spit up milk with a red mucus that may come from the mother or from the infant, mainly from the infant’s ingestion, bleeding from the upper gastrointestinal tract, respiratory tract and other problems, as well as from the mother’s broken nipples. You need to go to the hospital promptly for examination to clarify the cause and then treat accordingly. Common causes and treatment measures 1, intake of specific foods and oral iron: seen in babies who have eaten amaranth, red heart dragon fruit and other food pigments, anemic babies taking iron, such as undigested, vomiting, will be with red mucus. Generally need to observe, stop eating, the symptoms can disappear; 2, respiratory bleeding: generally due to respiratory irritation resulting in bleeding, such as bronchial and pharyngeal bleeding caused by violent cough, as well as gingivitis, rupture of the mucous membrane of the nose and bleeding. Anti-infective treatment such as erythromycin, azithromycin and amoxicillin can be used as prescribed by the doctor to stop coughing through dextromethorphan tablets, etc. 3. Upper gastrointestinal bleeding: such as bleeding caused by mucosal damage due to acute gastritis, gastric ulcer, etc. Need to stop breastfeeding immediately and keep the infant’s airway open. Perform routine blood and liver function tests and use hemostatic drugs as prescribed by the doctor to protect the gastric mucosa; 4. Blood system diseases: coughing up blood caused by platelet reduction or blood system diseases, etc., requires clear blood system examination; 5. Other: mother’s nipple bleeding, infant swallowing mother’s blood by eating breast milk, etc., identify the cause for further treatment. Note parents should feed the infant water diligently at ordinary times to avoid the skin and mucous membranes too dry, the infant who has added complementary food diet should be light, try to choose millet porridge and other foods, also need to pay attention to keep warm to prevent infection.