This study revealed the living manner in an institution with an infant unit by examining space and behavior, with a focus on individual occupants. We then examined how the planning of a children’s home influences their living style. As a result of the study, we discovered: 1) the importance of planning a dining kitchen area in the middle of each unit as a common area for staff members; 2) the necessity to examine the size and style of bedrooms according to the developmental stage of the occupants; 3) the necessity to provide spaces for playing and relaxation; 4) the importance of providing individual storage in respect of each occupant’s privacy; 5) the importance of doing housework within the unit.