Good child, bad child: the development of and relations between children's socioemotional competencies and moral self-concept from kindergarten to the end of Grade 1.

Socioemotional competencies (SEC) such as prosocial behaviour and emotion regulation are important for successful social interactions and develop early in life. A high moral self-concept (MSC), that is, children's view of themselves as moral actors, can support the development and application of SEC. The transition from kindergarten to school represents a critical period requiring well-adjusted SEC and MSC, yet research on this phase remains limited. This longitudinal study assessed data of 500 German children (M_{age_t1} = 60.97 months) and their teachers to examine the relation and stability of SEC and MSC over two years. After imputing data via multivariate imputation by chained equations due to missing ratings in teacher surveys, cross-lagged relations indicate that a stronger MSC in the last year of kindergarten can lead to greater SEC, which in turn can predict later MSC at the end of Grade 1. Both constructs showed stability over time, with significant correlations between SEC and MSC emerging only in primary school. Gender and socioeconomic differences for SEC and MSC were also observed. These findings enhance our understanding of the interplay between SEC and MSC and their development during the school transition.