There are many causes of bad breath in babies, such as oral diseases, throat diseases, as well as gastric disease Helicobacter pylori infection, and digestive system problems. 1, the most common cause of halitosis in children is mainly oral abnormalities, you need to pay attention to the baby’s mouth check to see if there is oral bleeding or local inflammation and other problems. Because there is bacterial reproduction, bacterial decomposition may produce abnormal odor resulting in bad breath occurs, you can take your baby to the stomatology department to see if there are problems such as gingivitis. 2, if it is caused by indigestion, it is possible that protein indigestion occurs corruption, the baby’s intestinal tract is not yet fully developed resulting. You need to give your baby an easy-to-digest diet, eat fresh fruits and vegetables in moderation, do not eat too much, do not give your baby spicy and stimulating food, take multi-enzyme tablets or oral probiotics. 3.After excluding the above situation, you can give your baby a gastrointestinal examination. Usually you need to use soft cotton swabs dipped in warm water to wash your mouth after feeding, and if you are a teething baby, pay attention to brush your teeth and rinse your mouth to maintain oral hygiene. Give the baby pediatric massage, acupuncture four suture points and so on. Give your baby a clockwise tummy massage.