Concerned.

So, I have a pit bull puppy that is mixed with Jack Russell. He's going on four months pretty soon. He looks like a jack Russell but has the character of a pit bull. I have one issue with him, he likes to bite my ankles when I walk. I can't get him to stop, and i've tried everything. He likes to bite ALOT, even kids. Should I be concerned about this behavior or will it go away? Ps, he loves people he just has that problem. & I didn't know where the heck else to post this, so I'm posting it here lol not a big deal 🤷🏻‍♀️🤷🏻‍♀️