One year old baby bad breath need to take appropriate treatment measures according to the specific causes. Oral hygiene habits are poor resulting in bad breath, need to adjust the diet, pay attention to oral hygiene; indigestion, constipation, bloating caused by bad breath can be appropriate to take probiotics. 1. Strengthen oral hygiene: one year old babies to eat dairy-based, milk contains sugar, dairy in the mouth can produce acidic products, prone to bad breath, therefore, it is best to give the child a few mouthfuls of water rinse mouth after feeding, you can get rid of bad breath, but also to protect the teeth. 2. indigestion, constipation: some babies constipation, bloating can also appear bad breath, oral probiotics such as bifidobacteria, but also can often give the baby massage abdomen to promote defecation. The causes of bad breath in one-year-old babies are more complex, lifestyle habits or dietary factors leading to bad breath, through the regulation of daily habits and diet can be improved, while the disease factors need to be based on the specific cause of the disease under the guidance of the doctor to take appropriate treatment measures.