Babies, adults as well as the symptoms of bad breath, bad breath is caused by what? First, food halitosis, food halitosis can often occur after eating onions, ginger, garlic, leeks, fish, shrimp, lamb and other foods, but stop using these foods, halitosis one to two days will disappear naturally. One-year-old baby is unlikely to have this situation. Second, corrosive halitosis, mostly caused by unhygienic mouth, such as not brushing teeth in the morning and evening, not rinsing after meals. The tartar that accumulates on the gums and the food residue stuffed in the gaps or cavities, fermenting and rotting, emits a foul odor. To eliminate this bad breath, we need to pay attention to oral hygiene. But one year old baby can not brush their teeth, then mom and dad can use water or gauze to clean the baby’s mouth after each meal. Third, acidic halitosis, which is also the main cause of bad breath of one-year-old babies. Most often seen in gastrointestinal dysfunction, a kind of indigestion caused by gastrointestinal dysfunction, often in the belching smell this odor, to the pediatric internal medicine, after treatment of gastrointestinal function recovery, bad breath will disappear.