“…This issue of the Infant Mental Health Journal follows several lines of research finding that a significant part of the origins of violence lies in the environment of prenatal to toddlerhood periods of development (Tremblay, ; Tremblay & Côté, this issue). In many ways, this focus on the very early periods of life reflects other examples of problematic outcomes such as childhood psychopathologies and school failure, also often found to have a basis in the first years of life (Caspi et al., ; Fearon & Belsky, ; Fitzgerald & Eiden, ; Hatzinikolaou & Murray, ; Lyons‐Ruth et al., ; Raine, this issue; Schore, ; Sroufe, ; Sroufe, Egeland, Carlson, & Collins, ). In addition, the articles in this special issue focus on another important line of research, which involves gender differences, concerning predilections for problematic behaviors related to sex‐specific neurobiological development, especially prevalent when children are raised under conditions of compromised caregiving (Golding & Fitzgerald , ; Holden, ; Kigar & Auger, ; Martel, ; McGinnis, Bockneck, Beeghly, Rosenblum, & Muzik, ; Schore, ; Zahn‐Waxler, Shirtcliff, & Marceau.…”