--- - |2 Warm caregiving is associated with concurrent hypothalamic–pituitary–adrenocortical (HPA) axis function, although the persistence of this association over time is less established. Using longitudinal and intervention studies, this meta‐analysis examined the enduring association of parental warmth (measured when children were ages < 1 through 15 years) with basal cortisol, reactivity and recovery (measured when children were ages < 1 through 25 years; k = 38; N = 6,608). These studies demonstrate no overall associations between parenting and children's HPA axis; instead there are small associations that vary based on moderators such as socioeconomic status, developmental stage, study design and stressor type, though many moderators are confounded. This first wave of studies indicates that the enduring association between parenting and cortisol is small and only understood in the context of other factors, and directly informs four sets of methodological and theoretical recommendations to strengthen this literature. - Child Development, Volume 89, Issue 5, Page 1485-1503, September/October 2018.