In brief: Freudian theory dictates that a child of a particular stage of development would have certain needs and demands, such as the need of the infant to nurse. Frustration occurs when the demands are not met. The psychological development of a child starts with the oral stage, then an anal stage, based on anal fixation, before moving on to the phallic stage, where they develop interest in genitalia, before entering the latency period, a period where their libido lie dormant , before finally proceeding to the genital stage, focusing on heterosexual relationships. Continue reading →