This work investigates the developmental milestones of an infant during the first year of life through systematic observation. Milicent Washburn Shinn, a pioneer in child psychology, utilizes her background in academic observation to document the physical, sensory, and cognitive growth of her niece. The text presents a structured framework for understanding early human development, moving beyond anecdotal evidence to provide a detailed, chronological record of maturation.

Experts recognize this work as a foundational text in the field of developmental psychology for its early application of empirical observation. Readers frequently note the historical significance of the prose, which provides a clear window into the origins of modern child study practices.