For nine-month-old babies with bad breath, the following methods can be applied to improve the situation: first of all, the application of antidiabetic and appetizing drugs to alleviate. The reason why some nine-month-old babies have bad breath is due to the symptoms caused by indigestion. After applying antidiabetic and appetizing drugs to the baby, the indigestion will be relieved, and the bad breath will disappear naturally, which can be applied to the baby, such as Baohe Pills or Wang’s Baochi Pills. Secondly, massage can be used to relieve the symptoms. Parents or doctors can use the palm of the hand on the baby’s navel, gently rubbing, can play a role in eliminating the accumulation of food, but also can improve the bad breath of children. Finally, the baby can be given timely application of antibacterial drugs according to medical advice.