Should My Child Take Medicine for a Sudden Cough?

My child has a sudden cough that has lasted for two days, but it’s not severe. He coughs occasionally, and his throat hasn’t become red and swollen yet. Sometimes, he has a hoarse voice. Can I give him the Three-bean Soup (black beans, green beans, and soybeans)? Besides drinking the soup, can he eat pomelos? Are there any foods to avoid? Thank you!
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