There are two reasons for the sudden hoarseness of the voice of a 2-month-old baby: 1. Children are particularly prone to crying, while drinking less water and milk, and in this case the child may have a sudden hoarseness of the voice. The child may have a sudden hoarse voice accompanied by a barking cough. The child will be accompanied by breathing difficulties discomfort performance. Parents need to actively take their children to the hospital for consultation and give nebulized inhalation to relieve acute edema in the throat to avoid life-threatening respiratory distress.