Emma Beyers-Carlson, M.S., is a doctoral student in Developmental Psychology at the University of Michigan. Her research interests center on typical and atypical families and how family members interact in systemic and interrelated ways. Specifically, her work focuses on how the interconnected relationships in the family system impact prosocial development in early childhood.Richard Gonzalez, Ph.D., is Professor of Psychology, Statistics, and Integrative Systems & Design; Research Professor in the Research Center for Group Dynamics and the Center for Human Growth and Development, and Director of the Research Center for Group Dynamics. He is also Director of the Biosocial Methods Collaborative. His research is in the area of judgment and decision making. He is interested in applied statistical models, longitudinal designs, data mining techniques, and research designs that integrate biological and behavioral processes.Patty X. Kuo, Ph.D., is currently a post-doctoral research associate in the Department of Anthropology at the University of Notre Dame. She received her Ph.D. in Developmental Psychology at the University of Michigan. Her research interests focus on father involvement in families with infants and young children from a biopsychosocial perspective.Wonjung Oh, Ph.D., is an Assistant Professor of Human Development and Family Studies at Texas Tech University. Her research focuses on the role of individual, relational, peer, and family factors in developmental trajectories of adaptive and maladaptive social behavior and relationships. She actively seeks novel, innovative approaches to basic and applied research questions pertaining to developmental and family processes across various transitions.Lauren Rosenberg, M.S., is the Project Coordinator for the Family Transitions Study. She received her Master's Degree in Developmental Psychology from Teacher's College, Columbia University and her undergraduate degree in Psychology and Women's Studies from the University of Michigan. She has interests in early childhood and family relationships.Paige Safyer, M.S., M.S.W., is a doctoral student in Developmental Psychology and Social Work at the University of Michigan. Her research focuses on infant social-emotional development within the parenting context. She is also interested in interventions that strengthen the parent-infant attachment relationship.Ju-Hyun Song, Ph.D., is currently a post-doctoral fellow in the Department of Psychology at the University of Toronto. She received her Ph.D. in Developmental Psychology from the University of Michigan. Her research focuses on the roles of children's social-emotional and social-cognitive characteristics for the development of prosocial behavior and aggression.Matthew M. Stevenson, Ph.D., is a Postdoctoral Research Fellow at the Center for Human Growth and Development at the University of Michigan. He received his Ph.D. in Clinical Psychology from Arizona State University in 2014. He is interested in the role of fathers in child development and developmental psychopathology.Elizabeth Thomason, Ph.D., is a data analyst for the Depression Center in the Department of Psychiatry and a lecturer in the School of Social Work at the University of Michigan. She received her Ph.D. in Psychology and Social work from the University of Michigan. Her interests center around women's depression in the perinatal period.Brenda L. Volling, Ph.D., is Professor of Psychology, and Director and Research Professor of the Center for Human Growth and Development at the University of Michigan. Her research focuses on the role of family relationships for early social and emotional development. She is the Principal Investigator of the Family Transitions Study, a longitudinal investigation of child and family functioning after the birth of a second child, which provided the data for the present monograph.Tianyi Yu, Ph.D., is an associate research scientist at the Center for Family Research, University of Georgia. She received her Ph.D. in Human Development and Family Studies at Auburn University, and was a former post-doctoral fellow on the Family Transitions Study. Her major research goal is to identify factors and processes associated with resiliency and vulnerabilities in children as well as young adults who experience family stress and transitions.Nina Howe, Ph.D., holds the Concordia University Research Chair in Early Childhood Development and Education and is a Professor in the Department of Education, Concordia University, Montreal, Quebec, Canada. Her areas of research include relationships (particularly sibling pretense, conflict, teaching, imitation), the social-cognitive development of preschool and school-aged children, children's play, and early childhood education.

• I. INTRODUCTION: UNDERSTANDING THE TRANSITION TO SIBLINGHOOD FROM A DEVELOPMENTAL PSYCHOPATHOLOGY AND ECOLOGICAL SYSTEMS PERSPECTIVE 7Brenda L. VollingII. METHODS AND PROCEDURES FOR THE FAMILY TRANSITIONS STUDY FROM A DEVELOPMENTAL PSYCHOPATHOLOGY AND ECOLOGICAL SYSTEMS PERSPECTIVE 26Wonjung Oh, Brenda L.Volling, Richard Gonzalez, Lauren Rosenberg, and Ju-Hyun SongIII. STABILITY AND CHANGE IN CHILDREN'S EMOTIONAL AND BEHAVIORAL ADJUSTMENT AFTER THE BIRTH OF A SIBLING 46Brenda L. Volling,Wonjung Oh, and Richard GonzalezIV. DEVELOPMENTAL TRAJECTORIES OF CHILDREN'S AGGRESSIVE BEHAVIORS AFTER THE BIRTH OF A SIBLING 53Brenda L.Volling, Richard Gonzalez,Tianyi Yu, and Wonjung OhV. DEVELOPMENTAL TRAJECTORIES OF CHILDREN'S ATTENTION PROBLEMS AFTER THE BIRTH OF A SIBLING 72Ju-Hyun Song,Wonjung Oh, Richard Gonzalez, Brenda L.Volling, and Tianyi YuVI. DEVELOPMENTAL TRAJECTORIES OF CHILDREN'S ANXIETY AND DEPRESSION AFTER THE BIRTH OF A SIBLING 82Elizabeth Thomason,Wonjung Oh, Brenda L.Volling, Richard Gonzalez, and Tianyi YuVII. DEVELOPMENTAL TRAJECTORIES OF CHILDREN'S EMOTIONAL REACTIVITY AFTER THE BIRTH OF A SIBLING 93Patty X. Kuo, Brenda L.Volling, Richard Gonzalez,Wonjung Oh, and Tianyi YuVIII. DEVELOPMENTAL TRAJECTORIES OF CHILDREN'S WITHDRAWAL AFTER THE BIRTH OF A SIBLING 106Wonjung Oh, Ju-Hyun Song, Richard Gonzalez, Brenda L.Volling, and Tianyi YuIX. DEVELOPMENTAL TRAJECTORIES OF CHILDREN'S SOMATIC COMPLAINTS AFTER THE BIRTH OF A SIBLING 118Emma Beyers-Carlson, Matthew M. Stevenson, Richard Gonzalez,Wonjung Oh, Brenda L.Volling, and Tianyi YuX. DEVELOPMENTAL TRAJECTORIES OF CHILDREN'S SLEEP PROBLEMS AFTER THE BIRTH OF A SIBLING 130Paige Safyer, Matthew M. Stevenson, Richard Gonzalez, Brenda L.Volling, Wonjung Oh, and Tianyi YuXI. GENERAL DISCUSSION: CHILDREN'S ADJUSTMENT AND ADAPTATION FOLLOWING THE BIRTH OF A SIBLING 142Brenda L.VollingREFERENCES 159ACKNOWLEDGMENTS 183COMMENTARYPREDICTING NORMATIVE AND PROBLEMATIC FAMILY PATHWAYS TO THE TRANSITION TO SIBLINGHOOD: COMMENTARY ON VOLLING ET AL.'S MONOGRAPH 184Nina HoweCONTRIBUTORS 196STATEMENT OF EDITORIAL POLICY 199SUBJECT INDEX 201

Emma Beyers-Carlson, M.S., is a doctoral student in Developmental Psychology at the University of Michigan. Her research interests center on typical and atypical families and how family members interact in systemic and interrelated ways. Specifically, her work focuses on how the interconnected relationships in the family system impact prosocial development in early childhood.Richard Gonzalez, Ph.D., is Professor of Psychology, Statistics, and Integrative Systems & Design; Research Professor in the Research Center for Group Dynamics and the Center for Human Growth and Development, and Director of the Research Center for Group Dynamics. He is also Director of the Biosocial Methods Collaborative. His research is in the area of judgment and decision making. He is interested in applied statistical models, longitudinal designs, data mining techniques, and research designs that integrate biological and behavioral processes.Patty X. Kuo, Ph.D., is currently a post-doctoral research associate in the Department of Anthropology at the University of Notre Dame. She received her Ph.D. in Developmental Psychology at the University of Michigan. Her research interests focus on father involvement in families with infants and young children from a biopsychosocial perspective.Wonjung Oh, Ph.D., is an Assistant Professor of Human Development and Family Studies at Texas Tech University. Her research focuses on the role of individual, relational, peer, and family factors in developmental trajectories of adaptive and maladaptive social behavior and relationships. She actively seeks novel, innovative approaches to basic and applied research questions pertaining to developmental and family processes across various transitions.Lauren Rosenberg, M.S., is the Project Coordinator for the Family Transitions Study. She received her Master's Degree in Developmental Psychology from Teacher's College, Columbia University and her undergraduate degree in Psychology and Women's Studies from the University of Michigan. She has interests in early childhood and family relationships.Paige Safyer, M.S., M.S.W., is a doctoral student in Developmental Psychology and Social Work at the University of Michigan. Her research focuses on infant social-emotional development within the parenting context. She is also interested in interventions that strengthen the parent-infant attachment relationship.Ju-Hyun Song, Ph.D., is currently a post-doctoral fellow in the Department of Psychology at the University of Toronto. She received her Ph.D. in Developmental Psychology from the University of Michigan. Her research focuses on the roles of children's social-emotional and social-cognitive characteristics for the development of prosocial behavior and aggression.Matthew M. Stevenson, Ph.D., is a Postdoctoral Research Fellow at the Center for Human Growth and Development at the University of Michigan. He received his Ph.D. in Clinical Psychology from Arizona State University in 2014. He is interested in the role of fathers in child development and developmental psychopathology.Elizabeth Thomason, Ph.D., is a data analyst for the Depression Center in the Department of Psychiatry and a lecturer in the School of Social Work at the University of Michigan. She received her Ph.D. in Psychology and Social work from the University of Michigan. Her interests center around women's depression in the perinatal period.Brenda L. Volling, Ph.D., is Professor of Psychology, and Director and Research Professor of the Center for Human Growth and Development at the University of Michigan. Her research focuses on the role of family relationships for early social and emotional development. She is the Principal Investigator of the Family Transitions Study, a longitudinal investigation of child and family functioning after the birth of a second child, which provided the data for the present monograph.Tianyi Yu, Ph.D., is an associate research scientist at the Center for Family Research, University of Georgia. She received her Ph.D. in Human Development and Family Studies at Auburn University, and was a former post-doctoral fellow on the Family Transitions Study. Her major research goal is to identify factors and processes associated with resiliency and vulnerabilities in children as well as young adults who experience family stress and transitions.Nina Howe, Ph.D., holds the Concordia University Research Chair in Early Childhood Development and Education and is a Professor in the Department of Education, Concordia University, Montreal, Quebec, Canada. Her areas of research include relationships (particularly sibling pretense, conflict, teaching, imitation), the social-cognitive development of preschool and school-aged children, children's play, and early childhood education.

• I. INTRODUCTION: UNDERSTANDING THE TRANSITION TO SIBLINGHOOD FROM A DEVELOPMENTAL PSYCHOPATHOLOGY AND ECOLOGICAL SYSTEMS PERSPECTIVE 7Brenda L. VollingII. METHODS AND PROCEDURES FOR THE FAMILY TRANSITIONS STUDY FROM A DEVELOPMENTAL PSYCHOPATHOLOGY AND ECOLOGICAL SYSTEMS PERSPECTIVE 26Wonjung Oh, Brenda L.Volling, Richard Gonzalez, Lauren Rosenberg, and Ju-Hyun SongIII. STABILITY AND CHANGE IN CHILDREN'S EMOTIONAL AND BEHAVIORAL ADJUSTMENT AFTER THE BIRTH OF A SIBLING 46Brenda L. Volling,Wonjung Oh, and Richard GonzalezIV. DEVELOPMENTAL TRAJECTORIES OF CHILDREN'S AGGRESSIVE BEHAVIORS AFTER THE BIRTH OF A SIBLING 53Brenda L.Volling, Richard Gonzalez,Tianyi Yu, and Wonjung OhV. DEVELOPMENTAL TRAJECTORIES OF CHILDREN'S ATTENTION PROBLEMS AFTER THE BIRTH OF A SIBLING 72Ju-Hyun Song,Wonjung Oh, Richard Gonzalez, Brenda L.Volling, and Tianyi YuVI. DEVELOPMENTAL TRAJECTORIES OF CHILDREN'S ANXIETY AND DEPRESSION AFTER THE BIRTH OF A SIBLING 82Elizabeth Thomason,Wonjung Oh, Brenda L.Volling, Richard Gonzalez, and Tianyi YuVII. DEVELOPMENTAL TRAJECTORIES OF CHILDREN'S EMOTIONAL REACTIVITY AFTER THE BIRTH OF A SIBLING 93Patty X. Kuo, Brenda L.Volling, Richard Gonzalez,Wonjung Oh, and Tianyi YuVIII. DEVELOPMENTAL TRAJECTORIES OF CHILDREN'S WITHDRAWAL AFTER THE BIRTH OF A SIBLING 106Wonjung Oh, Ju-Hyun Song, Richard Gonzalez, Brenda L.Volling, and Tianyi YuIX. DEVELOPMENTAL TRAJECTORIES OF CHILDREN'S SOMATIC COMPLAINTS AFTER THE BIRTH OF A SIBLING 118Emma Beyers-Carlson, Matthew M. Stevenson, Richard Gonzalez,Wonjung Oh, Brenda L.Volling, and Tianyi YuX. DEVELOPMENTAL TRAJECTORIES OF CHILDREN'S SLEEP PROBLEMS AFTER THE BIRTH OF A SIBLING 130Paige Safyer, Matthew M. Stevenson, Richard Gonzalez, Brenda L.Volling, Wonjung Oh, and Tianyi YuXI. GENERAL DISCUSSION: CHILDREN'S ADJUSTMENT AND ADAPTATION FOLLOWING THE BIRTH OF A SIBLING 142Brenda L.VollingREFERENCES 159ACKNOWLEDGMENTS 183COMMENTARYPREDICTING NORMATIVE AND PROBLEMATIC FAMILY PATHWAYS TO THE TRANSITION TO SIBLINGHOOD: COMMENTARY ON VOLLING ET AL.'S MONOGRAPH 184Nina HoweCONTRIBUTORS 196STATEMENT OF EDITORIAL POLICY 199SUBJECT INDEX 201

Emma Beyers-Carlson, M.S., is a doctoral student in Developmental Psychology at the University of Michigan. Her research interests center on typical and atypical families and how family members interact in systemic and interrelated ways. Specifically, her work focuses on how the interconnected relationships in the family system impact prosocial development in early childhood.Richard Gonzalez, Ph.D., is Professor of Psychology, Statistics, and Integrative Systems & Design; Research Professor in the Research Center for Group Dynamics and the Center for Human Growth and Development, and Director of the Research Center for Group Dynamics. He is also Director of the Biosocial Methods Collaborative. His research is in the area of judgment and decision making. He is interested in applied statistical models, longitudinal designs, data mining techniques, and research designs that integrate biological and behavioral processes.Patty X. Kuo, Ph.D., is currently a post-doctoral research associate in the Department of Anthropology at the University of Notre Dame. She received her Ph.D. in Developmental Psychology at the University of Michigan. Her research interests focus on father involvement in families with infants and young children from a biopsychosocial perspective.Wonjung Oh, Ph.D., is an Assistant Professor of Human Development and Family Studies at Texas Tech University. Her research focuses on the role of individual, relational, peer, and family factors in developmental trajectories of adaptive and maladaptive social behavior and relationships. She actively seeks novel, innovative approaches to basic and applied research questions pertaining to developmental and family processes across various transitions.Lauren Rosenberg, M.S., is the Project Coordinator for the Family Transitions Study. She received her Master's Degree in Developmental Psychology from Teacher's College, Columbia University and her undergraduate degree in Psychology and Women's Studies from the University of Michigan. She has interests in early childhood and family relationships.Paige Safyer, M.S., M.S.W., is a doctoral student in Developmental Psychology and Social Work at the University of Michigan. Her research focuses on infant social-emotional development within the parenting context. She is also interested in interventions that strengthen the parent-infant attachment relationship.Ju-Hyun Song, Ph.D., is currently a post-doctoral fellow in the Department of Psychology at the University of Toronto. She received her Ph.D. in Developmental Psychology from the University of Michigan. Her research focuses on the roles of children's social-emotional and social-cognitive characteristics for the development of prosocial behavior and aggression.Matthew M. Stevenson, Ph.D., is a Postdoctoral Research Fellow at the Center for Human Growth and Development at the University of Michigan. He received his Ph.D. in Clinical Psychology from Arizona State University in 2014. He is interested in the role of fathers in child development and developmental psychopathology.Elizabeth Thomason, Ph.D., is a data analyst for the Depression Center in the Department of Psychiatry and a lecturer in the School of Social Work at the University of Michigan. She received her Ph.D. in Psychology and Social work from the University of Michigan. Her interests center around women's depression in the perinatal period.Brenda L. Volling, Ph.D., is Professor of Psychology, and Director and Research Professor of the Center for Human Growth and Development at the University of Michigan. Her research focuses on the role of family relationships for early social and emotional development. She is the Principal Investigator of the Family Transitions Study, a longitudinal investigation of child and family functioning after the birth of a second child, which provided the data for the present monograph.Tianyi Yu, Ph.D., is an associate research scientist at the Center for Family Research, University of Georgia. She received her Ph.D. in Human Development and Family Studies at Auburn University, and was a former post-doctoral fellow on the Family Transitions Study. Her major research goal is to identify factors and processes associated with resiliency and vulnerabilities in children as well as young adults who experience family stress and transitions.Nina Howe, Ph.D., holds the Concordia University Research Chair in Early Childhood Development and Education and is a Professor in the Department of Education, Concordia University, Montreal, Quebec, Canada. Her areas of research include relationships (particularly sibling pretense, conflict, teaching, imitation), the social-cognitive development of preschool and school-aged children, children's play, and early childhood education.

• I. INTRODUCTION: UNDERSTANDING THE TRANSITION TO SIBLINGHOOD FROM A DEVELOPMENTAL PSYCHOPATHOLOGY AND ECOLOGICAL SYSTEMS PERSPECTIVE 7Brenda L. VollingII. METHODS AND PROCEDURES FOR THE FAMILY TRANSITIONS STUDY FROM A DEVELOPMENTAL PSYCHOPATHOLOGY AND ECOLOGICAL SYSTEMS PERSPECTIVE 26Wonjung Oh, Brenda L.Volling, Richard Gonzalez, Lauren Rosenberg, and Ju-Hyun SongIII. STABILITY AND CHANGE IN CHILDREN'S EMOTIONAL AND BEHAVIORAL ADJUSTMENT AFTER THE BIRTH OF A SIBLING 46Brenda L. Volling,Wonjung Oh, and Richard GonzalezIV. DEVELOPMENTAL TRAJECTORIES OF CHILDREN'S AGGRESSIVE BEHAVIORS AFTER THE BIRTH OF A SIBLING 53Brenda L.Volling, Richard Gonzalez,Tianyi Yu, and Wonjung OhV. DEVELOPMENTAL TRAJECTORIES OF CHILDREN'S ATTENTION PROBLEMS AFTER THE BIRTH OF A SIBLING 72Ju-Hyun Song,Wonjung Oh, Richard Gonzalez, Brenda L.Volling, and Tianyi YuVI. DEVELOPMENTAL TRAJECTORIES OF CHILDREN'S ANXIETY AND DEPRESSION AFTER THE BIRTH OF A SIBLING 82Elizabeth Thomason,Wonjung Oh, Brenda L.Volling, Richard Gonzalez, and Tianyi YuVII. DEVELOPMENTAL TRAJECTORIES OF CHILDREN'S EMOTIONAL REACTIVITY AFTER THE BIRTH OF A SIBLING 93Patty X. Kuo, Brenda L.Volling, Richard Gonzalez,Wonjung Oh, and Tianyi YuVIII. DEVELOPMENTAL TRAJECTORIES OF CHILDREN'S WITHDRAWAL AFTER THE BIRTH OF A SIBLING 106Wonjung Oh, Ju-Hyun Song, Richard Gonzalez, Brenda L.Volling, and Tianyi YuIX. DEVELOPMENTAL TRAJECTORIES OF CHILDREN'S SOMATIC COMPLAINTS AFTER THE BIRTH OF A SIBLING 118Emma Beyers-Carlson, Matthew M. Stevenson, Richard Gonzalez,Wonjung Oh, Brenda L.Volling, and Tianyi YuX. DEVELOPMENTAL TRAJECTORIES OF CHILDREN'S SLEEP PROBLEMS AFTER THE BIRTH OF A SIBLING 130Paige Safyer, Matthew M. Stevenson, Richard Gonzalez, Brenda L.Volling, Wonjung Oh, and Tianyi YuXI. GENERAL DISCUSSION: CHILDREN'S ADJUSTMENT AND ADAPTATION FOLLOWING THE BIRTH OF A SIBLING 142Brenda L.VollingREFERENCES 159ACKNOWLEDGMENTS 183COMMENTARYPREDICTING NORMATIVE AND PROBLEMATIC FAMILY PATHWAYS TO THE TRANSITION TO SIBLINGHOOD: COMMENTARY ON VOLLING ET AL.'S MONOGRAPH 184Nina HoweCONTRIBUTORS 196STATEMENT OF EDITORIAL POLICY 199SUBJECT INDEX 201