When A Button Is Swallowed
Children sometimes swallow buttons, fruit stones, thimbles and pennies. When the mother is sure that the child has swallowed a foreign substance the child should be encouraged and even compelled to eat plentifully of mashed potatoes, thick mush and coarse bread. Then follow with syrup of rhubarb or castor oil. Do not give the cathartic immediately on finding out the accident but make sure that much bulky food is taken. Give a child slippery elm to chew when it swallows a penny or button or hard object. This forms a slippery coating on the surface of the penny in the stomach which aids it in passing easily through the intestine and prevents its lodging there and was the remedy applied by a physician when called.
Source: Civic League Cook Book