“…The most flexible and adaptive stage of self-regulation develops after the third birthday. The stages of the development of self-regulation described by Kopp (1982) were also empirically confirmed (Harma, Rothbart, & Posner, 1997;Kochanska, Coy, & Murray, 2001;Rothbart, Ellis, & Posner, 2004;van der Mark, Bakermans-Kranenburg, & van Ijzendoorn, 2002;Vaughn, Kopp, & Krakow, 1984). However, one can argue (see also Kmita, 2013) that even early self-regulatory functions go behind simple self-control or self-restraint behaviors, so we use the term 'self-regulation' to describe regulatory functions in early childhood, using the Kopp's term 'selfcontrol' only to describe children's control of their own behavior (like self-restraint or compliance).…”