A "kiddie" is an informal term for a young child. It is commonly used to refer to small children in a casual or affectionate way. For example, "kiddie pool" means a pool designed for young children, and "kiddie movie" refers to a movie intended for young kids.

Additionally, "kiddie ride" is a term for child-sized coin-operated rides often found in amusement parks or malls for young children's amusement.

There is also a "kiddie tax" in the United States, which refers to a tax rule that applies to certain unearned income of a child at the parent's tax rate, but this is a different usage of the term.