Freudian phase of psychosexual development phallic psychosexual phase http://purl.bioontology.org/ontology/SNOMEDCT/472995002 The third stage of psychosexual development is the phallic stage, spanning the ages of three to six years, wherein the child's genitalia are his or her primary erogenous zone. It is in this third infantile development stage that children become aware of their bodies, the bodies of other children, and the bodies of their parents; they gratify physical curiosity by undressing and exploring each other and their genitals, and so learn the physical (sexual) differences between "male" and "female" and the gender differences between "boy" and "girl". phallic psychosexual phases