Kiddo (noun)

1. A young child or young person.
2. A term of endearment for a child or young person.

Origin:

Informal word originated from early 20th century american english, child or youngster.

Examples:

1. The kiddo was too young to understand what was happening.
2. She always called her little brother kiddo.
3. He was the youngest kiddo in the class.
4. The kiddo was so cute with her big brown eyes and curly hair.
5. The kiddo was full of energy and always on the go.