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The material presented in this volume is based on periodic developmental examinations of normative infants throughout the first year of life. Chapter III describes concretely the behavior characteristics displayed at fifteen age levels, from 4 through 56 weeks. The book is closely related in scope to "An Atlas of Infant Behavior," which portrays in action photographs the forms and early growth of patterns of human behavior. The atlas has already been reviewed in this journal.
The studies interpret mental growth as a process of progressive behavior patterning, which may be investigated from the standpoint of developmental morphology. "The action systems of embryo, fetus and infant undergo orderly changes of pattern, which are so consistent that we may be certain that these changes are governed by mechanisms of form regulation comparable with those which are being defined by the science of embryology."
With such an interpretation of the problem one realizes
Infant Behavior: Its Genesis and Growth.. Am J Dis Child. 1935;49(6):1686. doi:10.1001/archpedi.1935.01970060290027