Gruenberg, B. C. (1922). Instinct and habit. In B. C. Gruenberg (Ed.), Outlines of child study: A manual for parents and teachers (pp. 52-56). New York, NY, US: MacMillan Co.
http://dx.doi.org/10.1037/14746-013
Every normal child is born with a nervous system that is so arranged that various stimulations of the skin or of the sense organs bring about fixed responses. These responses to stimulation are unavoidable and in many cases can be brought about in the first place in no way except by the corresponding stimulation. Certain combinations of these reactions are called instincts, and they are often related to the adaptive adjustment of the child to his surroundings, as in the sucking response to an object brought into the mouth. From time to time, in the course of the child's development, there appear new modes of responding to the stimulations aroused by the environment; and some of the earlier instincts in turn disappear. This chapter discusses instinct and habit during child development. (PsycINFO Database Record (c) 2018 APA, all rights reserved)