Commentary by Dr. Anne Fausto-Sterling. The monograph reports the results of the first 10 years of a longitudinal study—The Trans Youth Project–that followed transgender, cisgender, and gender diverse children and youth (deMayo, Gallagher, Leshin and Olson, 2025). At first interview, the median age of the youths was 8.1 years, and at last reported visit 14.3 years. The researchers focused on young children in families supportive of their gender identities. Many of the study subjects had begun to socially transition.