It can be worrying to see your little one shivering, but this is a common response as his body fights the infection and his temperature adjusts after taking Ibugesic and Augmentin Duo. Shivering often occurs when a fever is rising or beginning to break. Wrap him in a light blanket for comfort, but avoid heavy bundling to prevent overheating. Keep offering small, frequent sips of water or rehydration solution, which is important since he was vomiting (managed by Emeset). Monitor his temperature and behavior closely. If the shivering persists, he becomes lethargic, or the fever spikes very high, please contact his pediatrician promptly.