Helen, 16 months old, has been eating a chocolate chip cookie. when her mom takes her to the bathroom to wash her face, helen looks in the mirror and touches a spot of chocolate on her cheek. based on this, her mother might take note that baby helen:

The correct answer is, baby Helen has developed self-awareness. 

Self-awareness refers to being aware or knowledgeable about oneself, one's behavior, feelings and physical appearance. Studies in developmental psychology have found that children develop self-awareness around 12-18 months of age. In the early stages of developing self-awareness, infants are able to recognize themselves in mirrors or photographs.