Three-year-olds cough during the day and sleep without coughing at night.

The child coughs during the day and does not cough at night. It is considered that the child has been exposed to allergic substances during the day, which will cause allergic cough in the child. It is also considered that bacterial or viral infection has occurred, which will also occur. It is recommended to take the child to the hospital for examination, clear cause and treatment.