My son just ate 1/4 of a moldy bun which he took out of his school bag. Should I be concerned and what will happen?

Believe it or not, if your son does eat a piece of bread or fruit with a little bit of mold, you might not even notice any symptoms. He might have some stomach pain, but the pain will be temporary and subtle. If the side effects do seem severe, visit the pediatrician immediately.

Monitor him carefully. If he show any signs of uncomfortable, vomit or diarrhoea than bring him to a doctor as soon as possible. There would be times that the child is able to expel it normally through the bowel. Just monitor him carefully.

As a precautionary measure, offer him some probiotics first (ie. biogaia, etc). Meanwhile, monitor him closely for any signs of discomfort.