i-adjective
Colloquial, often affectionate or childlike variant of 小さい. Used in casual speech, especially when speaking to children or in a cute manner.
See also: 小さい
この靴、ちいちゃいね。
These shoes are tiny, aren't they?
ちいちゃい頃はよくここで遊んだ。
When I was little, I used to play here a lot.