Aesthetics

Cuteness is usually characterized by (though not limited to) some combination of infant-like physical traits, especially small body size with a disproportionately large head, large eyes, a pleasantly fair, though not necessarily small nose, dimples, and round and softer body features. Infantile personality traits, such as playfulness, fragility, helplessness, curiosity, innocence, affectionate behavior and a need to be nurtured are also generally considered cute.

http://en.wikipedia.org/wiki/Cute