To ensure the longevity of a child's raincoat: - Regular Cleaning: Follow the manufacturer's instructions for cleaning. Most raincoats can be wiped down or machine washed. - Drying: Allow the raincoat to air dry thoroughly after each use to prevent mold and mildew. - Storage: Store the raincoat in a cool, dry place. Avoid keeping it folded for long periods as this can cause creases that might compromise its waterproof capabilities.