where was a part in the book when the children were getting raised

This is explained in chapter one. Like all children Equality 7-2521 was taken away from his parents, his early years spent in the Home of Infants. The narrative switches temporal registers, and we learn of this childhood -- one spent largely in a sleeping hall of one hundred beds, one peppered with fights with other children and frequent chastisement. From the ages of five to fifteen, Equality 7-2521 lives at the Home of the Students and there recites a creed every night with the other students before going to bed. The creed declares that the individual is nothing when compared to the group and the State.