The continuum concept is an idea, coined by Jean Liedloff in her 1975 book The Continuum Concept, that human beings have an innate set of expectations (which Liedloff calls the continuum) that our evolution as a species has designed us to meet in order to achieve optimal physical, mental, and emotional development and adaptability. According to Liedloff, in order to achieve this level of development, young humans (especially babies) require the kind of experience to which our species adapted during the long process of our evolution by natural selection. Source: Wikipedia (en)