Bleaches, household cleansers and drugs are the most common substances accidentally ingested by preschoolers and are potentially toxic.

But the telltale symptoms of nausea, vomiting and abdominal pain don't always indicate serious injury, says Contemporary Pediatrics magazine. What's swallowed is usually small and water or milk can be given to the child to dilute it. Don't use acids such as vinegar or lemon juice. Call your pediatrician but don't panic - further treatment may not be needed.