Depriving him of the breast, could lead to serious problems in his personality development.
剥夺他的乳房，可能会导致他的人格发展出现严重问题。
耶鲁大学公开课：心理学导论
So, Freud believed there were five stages of personality development, and each is associated with a particular erogenous zone.
因此，弗洛伊德认为人格发展有五个阶段，每个阶段都与特定的性欲区相关。
英语百科
Personality development
Personality development is defined as the relatively enduring pattern of thoughts, feelings, and behaviors that distinguish individuals from one another. The dominant view in the field of personality psychology today holds that personality emerges early and continues to change in meaningful ways throughout the lifespan. Evidence from large-scale, long-term studies has supported this perspective.