One-year-old baby’s bad breath like the smell of stool need to first pay attention to whether it is not pay attention to oral hygiene, such as the baby after eating without rinsing, or morning and evening did not brush teeth on time, can lead to a large amount of food residue left in the mouth, residual food fermentation can produce bad breath, sometimes, like the smell of stool. One-year-old baby has added complementary foods, parents should pay attention to the baby to develop good hygiene habits, such as brushing teeth on time, rinse mouth after meals, thus reducing the occurrence of bad breath. After ruling out this situation, you can pay attention to whether the baby has indigestion, constipation, diarrhea: 1, indigestion: baby’s digestive system is not well developed, cold or improper diet can lead to digestive disorders, which leads to food staying too long in the stomach, fermentation and decomposition by intestinal bacteria, you can have the symptoms of bad breath. Parents should pay attention to avoid letting the baby get cold, at the same time should pay attention to the baby’s complementary food should be added gradually, not too much, try to add easy to digest porridge, noodles, etc.. In addition, under the guidance of a doctor can take oral probiotics to regulate intestinal flora, to relieve the symptoms of indigestion; 2, constipation: if the baby constipation, can lead to the intake of food stays in the intestine, and the milk contains a lot of protein, can produce ammonia, ammonia from the mouth, you can have bad breath. Can be regulated from the diet, such as adding fiber-rich fresh vegetables and fruits in complementary foods, such as cabbage, spinach, celery, yams, sweet potatoes, carrots, pumpkin, etc., so as to promote defecation and relieve constipation; 3, diarrhea: If the baby has diarrhea, bacteria in the intestines, viruses make food fermentation, and then bloating, bad breath like the symptoms of stool. Probiotics can be taken to regulate, if the stool is watery, you can follow medical advice for the treatment of anti-diarrhea. At the same time, the baby’s supplementary food should be adjusted, it is appropriate to eat milk, rice soup, thin porridge, noodles, etc., and drink water appropriately.