The coin-sized battery that can burn a throat in 2 hours

That shiny little disc powering a key fob, greeting card, or bathroom scale is one of the most underestimated hazards in a home with toddlers. When a button battery (a lithium coin cell) gets stuck in a child's esophagus, it doesn't just sit there — saliva completes the circuit and triggers a chemical reaction that generates hydroxide, a caustic substance that can start burning through tissue in as little as 2 hours. The child may have swallowed it silently, with no choking and no obvious moment to point to.

The symptoms are sneaky because they mimic everyday illness: drooling, refusing food, gagging, a hoarse cry, or fever. Because there's often no witnessed swallow, these signs get chalked up to a cold or teething while the clock is running. This is why prevention matters so much — check that battery compartments on toys and gadgets are screwed shut, and store loose or spent batteries out of reach (a dead battery can still carry enough charge to injure).

If you suspect a swallow, this is a call-911 / go-to-the-ER-now situation, not a wait-and-see one. For a child over 12 months, poison-control and pediatric guidance is to give honey every 10 minutes on the way to the hospital — it coats the battery and has been shown to slow the caustic burn, buying time. Don't induce vomiting, and don't offer food or drink otherwise.