Its a phase. They do it then don't do it.
Then do it then don't do it.
Then do it then don't do it.
Then before you know it, they are Teenagers, and they are doing it, then too.
So whatever method works for you, to "stop" it... or curb it, then try it.
It usually takes a variety of approaches.
But the person needs to know, that you mean "no" when you say it. Too. And that there are, consequences.
Some adults/Husbands/Spouses routinely do this too.
Sorry, I am not being sarcastic.
I am just observing what I see and having a rumpled day.
I have 2 kids who are 5 & 9.