kid stuff

noun

, Informal.

1. something appropriate only for children.
2. something very easy or simple.

Word History and Origins

Origin of kid stuff¹

An Americanism dating back to 1925–30

Idioms and Phrases

Something very easy or uncomplicated, as in That new computer program is kid stuff . This usage alludes to something suitable for young children, or “kids.” [c. 1920]

Example Sentences

Throughout the 1950s and ’60s, monster movies were largely seen as kid stuff.

From Vox

Deconstruction is kid stuff—this one delves deep into the psychology behind the universal need to confront evil.

From The Daily Beast

Helen, honey—Tim knows that wishing when you blow out the candles is kid stuff.

From Project Gutenberg

The only time I played football it was just kid stuff, and we wore whatever we had.

From Project Gutenberg