Answer:
Oral
Explanation:
According to the famous psychoanalyst Sigmund Freud, psychological development in childhood takes place during five psycho-sexual stages: oral, ana*l, phallic, latency, and genital. And it determines their personality development later in life. In the first stage also called oral stage, children tends to satisfy libido, which is placed in their mouth. and fixation at this stage seeks oral stimulation through smoking, overeating, smoking cigarettes, etc.