Aspects of this topic are discussed in the following places at Britannica.
...their behaviour; there appeared to be a hereditary scheme for development in the four areas of motor skills, adaptive behaviour, language development, and personal and social skills. In Infancy and Human Growth (1928), he presented a developmental schedule based on this theory, using 195 items of behaviour to evaluate infants of between 3 and 30 months. In 1938 Gesell and Helen...
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