Baby oral odor, the general common causes may have the following aspects: First, baby oral odor, you need to pay attention to the baby oral cleaning care, such as for slightly older babies, adding food diversity, if the baby does not pay attention to oral hygiene care habits, not brush teeth, not rinse mouth will cause the breeding of bacteria, thus causing oral odor, so be sure to give the baby good oral care work. In addition, one of the most common causes of bad breath is the presence of indigestion, when many babies in most cases may be accompanied by fart, stool defecation efforts, or constipation, reduced appetite, for small babies may also contain more milk flaps in the stool, for this situation, you can generally give the baby oral probiotics to regulate the intestinal micro-ecological environment, can help promote digestive function.