Around ages four to six, many children suddenly seem to care deeply about winning and losing. A game that used to be fun can quickly turn into tears, frustration, or angry protests of “It’s not fair.” When adults see this, it’s easy to worry: Is my child becoming too competitive? Are they a sore loser? Did we do something wrong?

In this episode of The Scientific Parenting Diary, we step away from advice and strategies, and focus instead on understanding. From a developmental and emotional perspective, we explore what is actually happening inside a preschool child when winning starts to feel urgent — and losing starts to feel unbearable.

We look at why this shift often emerges around ages four to six, how children’s developing sense of self, fairness, and control shapes their reactions, and why losing can feel like a personal threat rather than just an outcome. We also unpack why children may respond very differently when they lose to parents versus when they lose to peers.

This is a mechanism-focused episode, designed to help parents see these moments not as behavior problems to fix, but as signals of important emotional and cognitive development. By understanding what “winning” and “losing” mean to young children at this stage, we can approach these moments with more clarity, patience, and emotional safety — for both our children and ourselves.