What brought the study of child development into the academic mainstream and made developmental psychology a first-level discipline within university psychology programs in the mid-19^th century?

Question

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The increasing scientific rigor practiced in developmental research, including the use of longitudinal studies and experimental methods, helped bring the study of child development into the academic mainstream and establish developmental psychology as a first-level discipline within university psychology programs in the mid-20th century. While practical application, communication between researchers, and collaboration with other fields may have contributed to this development, they are not the primary factors cited in the question.

What Brought the Study of Child Development into the Academic