Which of the following pas of the mind develops at approximately the time a child stas first grade?

The superego develops at approximately the time a child stas first grade (6 years of age). The superego controls id (the sexual and aggressive aspects of the mind) impulses and represents moral values and conscience. The ego (the personality) and the id develop at earlier ages. The unconscious and the conscious minds also develop at earlier ages Ref: Nelson paediatrics; Table 11-1 .