High levels of infant negative affect are associated with behavior problems in toddlerhood, which in turn are a risk factor for chronic behavior problems throughout childhood, especially in the context of poor parenting and psychosocial risk. Studies suggest that sensitive parenting may buffer temperamental risk in infancy by supporting self-regulation and emotion regulation (Gottman, Katz, & Hooven, 1997). Parental reflective functioning (RF) (Slade, 2005) underlies sensitivity and is a target for early interventions aimed at supporting parenting and child development. In this study, we examine whether RF-that is, the capacity of a parent to put oneself in the mind of the other (child) and see the child's behaviors as driven by his/her mental state-will protect against the effects of infant negative affect on toddler behavior problems after controlling for psychosocial risk.Early Onset of Behavior ProblemsBehavior problems in early childhood may originate from temperamental risk that is exacerbated by other parenting and psychosocial risks. Behavior problems are described in two broad domains-internalizing behavior and externalizing behavior-and each type can follow different developmental trajectories. Internalizing behavior problems have been defined as behaviors directed inward toward the self. Evidence suggests that children with internalizing behavior problems are often identified as being socially withdrawn in interactions with peers and teachers (Eisenberg et al., 2001) and are at risk for later psychopathology, including depression and anxiety. Externalizing behavior problems are defined as problematic behaviors, including hyperactivity and increased levels of aggression, directed toward the external environment (Achenbach, 1992). Some children exhibit internalizing and externalizing disorders simultaneously. One typical trajectory of behavior problems peaks in toddlerhood and decreases throughout preschool (Alink et al., 2006; Hill, Degnan, Calkins, & Keane, 2006; Tremblay, 2004). Whereas some problem behaviors during this period are developmentally appropriate, as many as 25% of young children exhibit clinically significant levels of behavior problems, and a subgroup of these children struggle with chronic behavior problems (Campbell, 1995). It is important to understand factors that predict high and chronic levels of behavior problems in childhood because they are targets for early intervention. Infants with high levels of negative affect may be regarded as showing a difficult temperament and may be at risk for early-onset behavior problems.Infant Temperament and Behavior ProblemsTemperament is involved in personality and behavior (Nigg, 2006). Infant temperament has been described as a biologically engrained pattern of behavior associated with an individual's reactivity and ability to endure new situations, people, and experiences (Rothbart & Derryberry, 1981). Several studies suggest three overarching dimensions of infant and toddler temperament: extroversion-surgency, negative affect, and effortful control (Casalin, Luyten, Vliegen, & Meurs, 2012; Gartstein, Knyazev, & Slobodskaya, 2005; Gartstein & Rothbart, 2003). Casalin and colleagues (2012) found that these dimensions of temperament demonstrated stability over a 1-year period from infancy to toddlerhood. Further, dimensions of infant temperament have been linked to later personality traits and psychopathology. High levels of negative affect, in particular, have been linked to internalizing and externalizing behavior problems in childhood and more serious behavioral and emotional problems over time, including antisocial behavior throughout adulthood (Caspi, Henry, McGee, Moffitt, & Silva, 1995; Egger & Angold, 2006; Eisenberg et al., 2000; Gartstein, Putnam, & Rothbart, 2012; Morris et al., 2002; Rubin, Burgess, Dwyer, & Hastings, 2003). The negative-affect dimension includes negative emotions such as fear, anger, frustration, and sadness (Rothbart & Derryberry, 1981). …
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