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How can a 4-year-old cough quickly?
First of all, it needs to be clear that cough is a reaction of self-protection of the body, which helps to remove foreign bodies and sputum in the respiratory tract. Therefore, if children's cough is not very serious and there are no other symptoms, the following measures can be taken to help relieve cough:

1. Give your child plenty of water: water can help dilute sputum and make it easier to cough up.

2. Keep the air moist: You can use a humidifier or put a pot of water in the room to increase the humidity of the air, which will help reduce the dryness and irritation of the throat.

3. Avoid irritating substances such as smoke, dust and pollen. It will stimulate the child's respiratory tract and aggravate cough symptoms.

4. Proper exercise: Proper exercise can promote the health of blood circulation and respiratory system, but avoid strenuous exercise.

5. Dietotherapy: You can give your child some foods such as pear juice and honey water to moisten the lungs and relieve cough.

If the child's cough is severe or lasts for a long time, it is recommended to seek medical advice in time so that the doctor can make further diagnosis and treatment.