He focused on the progressive replacement of " erotogenic zones in the body by others. This early biological organism of sexuality first looks for oral gratification by sucking at its mother's breast, which later will be replaced by other objects. At first, the infant is not able to recognize the distinction between itself and the breast, but it soon begins to see its mother as its first external love object. Freud would later argue that before the infant reaches this point of understanding, it is able to see its own self as a love object and develop into a narcissistic love of its personhood.

Once the child goes through this oral state during the second year of life, its erotic emphasis transfers to the anus. This is encouraged by the challenges of toilet training. The child's enjoyment from defecating comes into conflict with the need for self-control. The third phase...
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