Levels of self consciousness for a baby: L1, Understanding where the body starts and ends. L2, Understands body in relation to others. Ability to imitate and feels a sense of causality. L3, (mirror test), refers to themselves using I and me. Communicates using language. L4, a sense of identity and being able to recognise oneself in things outside of context. L5, Understand that others have judgements and impressions of them.
Some animals are able to reach level 5, while some humans are not, or struggle to.