1 [countable] informal
She'd always loved animals since she was a little kid.
He's married with three kids.
A neighbor volunteered to keep an eye on the kids (=their children or the children they are responsible for).
2 [countable] informal
a young person:
3 [countable usually singular]
used by adults to address a person who is younger than them:
Hey kid, come here.
4 also kid stuff American English
something that is too easy or boring:
Pokemon? Oh boy, that is kid stuff!
a young goat
very soft leather made from the skin of a young goat:
a pair of white kid boots