K ayla, age 48 months, is waiting for her mother to stop working so Kayla can finally open the tempting gift on the table. "Maybe it's candy. I want to eat it!" Kayla has a plastic toy horse, but its leg is missing. "This horse is broken, Mom." Her mother is busy and just nods. Kayla sighs. She trots the toy horse across the table until its nose touches the shiny wrapped gift. Kayla stops for a minute and then says, "Don't cry, horsey. I'll take you to the doctor." For another 2 minutes, Kayla plays doctor with the horse, talking to her patient continuously. She's interrupted when her mother, finished working, says, "You can open your gift now." Kayla drops the horse and rips open the gift.Between ages 2 through 5 years, children begin to engage in behaviors regarded as strategies that enable autonomous, effortful (nonreactive) selfregulation of emotion. This form of emotion regulation is conceptualized as a process by which the use of strategies forestalls, minimizes, or resolves emotions evoked by anticipated, actual, or perceived situations (Cole et al., 2019;Gross, 2015). The emergence of autonomous emotion regulation is viewed as the product of internal (e.g., child cognitive and language skills) and external (e.g., socialization) factors (Bell & Wolfe, 2004;Kopp, 1989). Ample evidence links parental socialization and children's emotion regulation, and other evidence links children's cognitive skills-namely executive functions-to their emotion regulation. These cognitive resources are thought to enable children to redirect their attention from sources of distress, to avoid enacting prepotent behaviors,