Background: During the last decades, the research on mother-infant dyad has produced a great amount of data, methods and theories, which largely contributed to set a revolution in the way we look at developmental changes during infancy and childhood. Very different constructs depict the different aspects of the “dyadic dance” occurring between a mother and her infant; nonetheless, a comprehensive and consistent systematization of these concepts in a coherent theoretical landscape is still lacking.Aim: In the present work, we aim at disentangling the different theoretical and methodological definitions of 9 dyadic constructs and we highlight their effects on infants' and children developmental outcomes.Methods: A literature search has been conducted on three databases—PubMed, Scopus, Web of Science. Three different reviews are reported here: (1) a review on the theoretical definitions of dyadic constructs; (2) a review of operational definitions, settings and methods of dyadic processes; (3) a systematic review of dyadic processes' outcomes for infants' and children developmental trajectories.Results: Two constructs emerged as wide meta-theoretical concepts (reciprocity and mutuality) and seven described specific processes (attunement, contingency, coordination, matching, mirroring, reparation, synchrony). A global model resuming the relationships among different processes is reported, which highlights the emergence of two specific cycles of dyadic functioning (i.e., matching-mismatching-reparation-synchrony; contingency, coordination, attunement, mirroring). A comprehensive review of the adopted measures is also provided. Finally, all the processes provided significant contributions to infants' behavioral, cognitive, and socio-emotional development during the first 3 years of age, but limited research has been conducted on specific processes (e.g. reparation and mirroring).Conclusion: The present study provides an original research-grounded framework to consider the different nature of mother-infant dyadic processes within a unified dyadic eco-system. Different levels of evidence emerged for the role of diverse mother-infant dyadic processes on infants' and children development. Open questions and future research directions are highlighted.

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Objective: This study examined the impact of the coronavirus disease 2019 (COVID-19) pandemic in Italy by specifically looking at the psychosocial response of children/adolescents with neurodevelopmental disabilities (NDD) and their parents, and explored which factors could potentially contribute to increasing or mitigating stress-related behaviors in children/adolescents as well as their parents’ stress. Method: An online anonymous survey was designed to investigate family demographic characteristics, COVID-19 outbreak and restriction-related variables, children/adolescents’ behavioral regulation problems, parental stress, and resilience. Data were collected from 1,472 parents (83.1% mothers) of 1632 NDD children/adolescents (33.7% females). Results: Compared to pre-emergency, parents reported a significant increase in their children’s behavioral regulation problems: Anxious/depressed behavior, Attention problems, and Aggressive behavior (p < .001), and they reported feeling more Overwhelmed and Burdened (p < .001) as parents but less Unfulfilled, Numbness, Devastated, and Angry (p < .001). A hierarchical stepwise regression analysis revealed that both behavioral regulation problems in NDD children/adolescents and parental stress are—at least partially—buffered by resilience factors in parents (Perception of self, Planned future, Family cohesion). Conclusions: Results showed that behavioral regulation problems in children/adolescents with NDD and parental stress increased. However, parental resilience can act as a protective factor, counterbalancing parental difficulties in the care of their NDD children during the emergency. Identifying risk and protective factors impacting the psychosocial response ofchildren/adolescents with NDD and their parents is essential to implement appropriate support interventions both for parents and children/adolescents with NDD during the COVID-19 pandemic.

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