Rugrat (noun)

A young child, especially one who is still crawling or learning to walk.

Origin:

Slang, origin unknown.

Examples:

1. I can't believe how fast my rugrat has grown up.
2. I had to watch my rugrat very closely while he was crawling around the house.
3. The rugrats were running around the playground.
4. She's such a sweet rugrat, always getting into something.
5. I can't wait to take my rugrat on his first trip.