AUTHOR=Sansavini Alessandra , Libertus Klaus , Guarini Annalisa , Libertus Melissa E. , Benassi Mariagrazia , Iverson Jana M. TITLE=Editorial: Understanding Trajectories and Promoting Change From Early to Complex Skills in Typical and Atypical Development: A Cross-Population Approach JOURNAL=Frontiers in Psychology VOLUME=12 YEAR=2021 URL=https://www.frontiersin.org/journals/psychology/articles/10.3389/fpsyg.2021.647464 DOI=10.3389/fpsyg.2021.647464 ISSN=1664-1078