The "onion hack" for relieving cough and fever in kids involves placing a cut onion in the child's room or putting it at the bottom of their feet covered with socks overnight. It's believed that the onion's sulfur compounds can help absorb toxins and improve air quality, potentially easing respiratory symptoms and reducing fever. This remedy is a popular home practice, though scientific evidence supporting its effectiveness is limited. Always consult a healthcare professional for serious symptom