Well-being is a significant concept in research, policy and practice in education, but consensus about what it is is challenging. In addition, the well-being of children under eight is under-researched. Using online surveys, this paper looks at the perspectives of 155 parent/carers and 285 practitioners in England on young children's well-being. In many areas, there were high levels of agreement: the importance of fun and laughter, feeling good about oneself, feeling listened to, good family relationships, time and space to play and opportunities to express thoughts and feelings. Parents/carers emphasized 'love' whilst practitioners emphasized listening to children. Practitioners also strongly emphasized the importance of their relationships with children and parents/carers. The paper concludes that, whilst the perspectives of parents/carers and practitioners are valuable, a full understanding of young children's well-being needs to include their voices as well as those of adults.