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This book is a continuation of the studies initiated by Gesell in his previous book, "The Mental Growth of the Pre-School Child." It contains a great deal of material on the growth of the infant. Gesell makes use of the comparative study of infants, a method which he stressed in his first book. By this means the author is able to observe, by contrast, characteristics which would otherwise escape attention. He was able to make studies of infants at various age levels, observing those with a difference in age of exactly one month. It is difficult to accept the fact that what is true of one child of 1 month or 6 months of age is necessarily true of all children of these ages. Yet on this basis of individual studies at various age levels Gesell says that there are certain basic uniformities in the dynamics of development which apply