E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Born with a Silver Spoon,
or Born with a silver spoon in ones mouth. Born to good luck; born with hereditary wealth. The reference is to the usual gift of a silver spoon by the godfather or godmother of a child. The lucky child does not need to wait for the gift, for it is born with it in its mouth or inherits it from infancy.