During the first year of life children are at the greatest risk for experiencing homelessness (Perlman & Fantuzzo, 2010). Unfortunately, data on the number of infants and toddlers experiencing homelessness are extremely limited, and any data available are inadequate for a variety of reasons. There is minimal information on how many young children and families experiencing homelessness benefit from early childhood programs and support services aimed at addressing the needs of this vulnerable population. This article presents a summary of existing data and the challenges encountered in using this data to better understand the scope of homelessness during the first years of life. The author provides suggestions to improve data collection practices and the processes for identifying families and children experiencing homelessness to enhance access to early childhood services.