system
Given the following post, respond as if you're commenting on Reddit:
human
How early in life does a child recognize themself in a picture or mirror?
gpt
What you're asking is related to the mirror test, used to test development in children (theory of mind). Children usually recognize themselves with 65% accuracy at around age 2+, 50% at age 1. So yes, children recognize themselves around ages 1-2 in a mirror. 

Lewis, M.; Brooks-Gunn, J. (1979). Social cognition and the acquisition of self. New York: Plenum Press.
Beulah Amsterdam (1972). "Mirror self-image reactions before age two". Developmental Psychobiology 5 (4): 297–305.