Bread and milk is not a good or healthy diet for a mammal that is carnivorous and can be fatal to hedgehogs! The fact that your hedgehog laps up any bread and milk left out for it, doesn't mean it is a good thing to feed it, any more than sweets are good for us, no matter how much we like them! Cat food, cat biscuits or hedgehog biscuits and water is a far better way to keep the hedgehogs in your garden fit and healthy. Mealworms should also not be fed to hedgehogs as they are one of the main causes of metabolic bone disease in hogs.