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Foreign body ingestion is common in young children, most often involving coins, magnets, or button batteries. Coins usually pass through the digestive tract without intervention. Magnets rarely cause harm unless more than one is swallowed. Button batteries, on the other hand, are dangerous because their size allows them to lodge in the oesophagus. Among 79 cases seen at a French paediatric centre, nearly 40% developed complications, including mediastinitis, oesophageal stenosis, perforation, and fistula formation ( Arch Dis Child doi:10.1136/archdischild-2025-328576).