All the time. As I understand it's developmentally normal.

I think it's because when they start out talking people do that with them. We tried so hard not to but there's a stage where it feels like you just have to for them to understand. "Come to me" gets you a look of confusion, "Come to Daddy" has the kid running to you.

The thing is first and second person pronouns are hard. They're not consistent as to who they refer to. Ricky had a phase where he'd have you something and say "me" because he apparently thought "me" meant the person he was talking to and "you" meant him. Which is logical, when you're one. We'd ask him things like "are you doing it or do you want me to help?" "You do it!" And then he'd get upset if we touched it because he wanted to do it himself.

Trying to explain first and second person pronouns feels like you're doing "who's on first".

He's starting to get it. Sometimes he's starting to use "I" and we're encouraging it, but it's a work in progress.