“…It may be particularly interesting to understand how playfulness is associated with humour, given the obvious conceptual overlap between the two constructs, and the adult playfulness literature which suggests a positive association between them (e.g., Yue et al, 2016). The manner in which children use humour in their social interactions with peers has been shown to be associated with broader school adjustment (e.g., James & Fox, 2018;Paine, Howe, Karajian, Hay, & DeHart, 2019), and further research may uncover similar functions for a playful disposition. Furthermore, humour in early childhood has shown sex di erences, with recent research showing that by 7 years of age, boys produce more humour compared to girls (Paine et al, 2019), suggesting that boys' and girls' humour, like the current ndings for playfulness, may come to vary as a function of sex with development.…”