A one and a half year old baby with small bumps in the mouth, may be related to oral ulcers, herpes simplex virus infection and other factors, mainly to drug treatment, while with daily care. 1. Mouth ulcers: mouth ulcers can be used to relieve the symptoms of the open-throat sword spray, and need to pay attention to a light diet do not eat spicy and stimulating food. 2. Herpes simplex virus: If the herpes simplex virus is the cause of the above situation, you can use ribavirin, interferon spray and other drugs to treat, pay attention to oral hygiene. One and a half year old baby mouth with small bumps may have other recommendations, timely to the hospital for relevant examinations, clear lesions and targeted treatment, the above drugs are under the guidance of the doctor to take, do not use on their own.