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Erikson's stages of psychosocial development - Wikipedia

Educational Psychology Interactive: Cognitive Development

Erik Erikson’s Stages of Social-Emotional Development
However, if the particular needs of any of these phases were either unfulfilled or gratified to excess, the child could get “fixated and thus hampered in its psycho-sexual development.

Lawrence Kohlberg's stages of moral development - Wikipedia



If the toilet training is very strict or there is much rejection or there is separation from the mother at this stage, the child can get fixated at this stage of psycho-sexual development.

 

Piaget Cognitive Stages of Development - WebMD


The fundamental establishment of sense of one’s self as male or female is set in place by the age of three years.

The most important influences on gender identity and role development are learnt rather than biologically controlled by hormones or genetics.


Anything going wrong at this stage of psycho-sexual development, disappointment at breast, separation from mother can lead to frustration and can cause fixation of the personality at this phase.


Piaget's Stages of Cognitive Development

This instinct which strives for sensual pleasure, is at first diffused and attains its eventual proper maturation only through a process of “Psycho-sexual Maturation.”
A child’s personality development is a contest between biological drive and cultural constraint.