Anxiety and acting like a child?

I’ve noticed when I get EXTREMELY anxious and overwhelmed for a long period of time and then finally get to calm down I then become almost a child. I am 20f and will just kinda walk around and talk like an excited kid and kick my feet and just act how I used to when I was little. I’ll literally be a kid. Is this normal? Like that’s how I am right now. I don’t think I’m a kid, I can still respond to adult situations, but while I’m in a calm setting I act like a little kid again. What is this?