a sentence

[Jandi]

Hello, teachers!

Is this sentence well-formed?
- [Come along, Hurry up], children! Get/Put your coats on, or you'll be late for school.

Thank you very much.
Peace!

[Casiopea]

Hello, teachers!

Is this sentence well-formed?
- [Come along, Hurry up], children! Get/Put your coats on, or you'll be late for school.

Thank you very much.
Peace!

Is the third comma (,) necessary?

Children! Get/Put your coats on or you'll be late for school. (OK)
2. Come along, hurry up children! Get/Put your coats on or you'll be late for school. (OK)