Peanuts are best avoided in children until seven years of age. In those without allergy risk factors, only smooth peanut butter is appropriate in the smallest amount in a sandwich. Peanuts and peanut butter have properties that cause them to easily stick in the back of the mouth, which can cause gagging and choking. If inhaled, they cause problems not only because of blocking the airway but also because of inflammation around the area where it lodges in the airway if the child survives the intial choking episode.