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]