“Does {child_name} say 'I' or 'me' when talking about {him_her}self — 'I did it', 'me too'?”
Follow-up: “Or does {he_she} still use {his_her} own name — 'Lucy do it' rather than 'I do it'?”
Not yet
Refers to {him_her}self only by name
Emerging
Uses 'I' or 'me' occasionally, often alongside name
Developing
Mostly uses 'I' or 'me' for self-reference
Secure
Consistently uses first-person pronouns in conversation
Saying 'I' is a big self-awareness step — a new way of locating {him_her}self in the family.