“…Mühlenweg et al (2012) found that relatively young children starting school could harm their development of non-cognitive skills like activity, approach/withdrawal, soothability, adaptability, emotionality/persistence, and intensity of reaction, rhythmicity, order of biological function and threshold of responsiveness. However, the results of the other researches indicate that relative age differences do not systematically direct behavioral characteristics such as self-confidence, competition preference, risk attitude and occupational expectations (Lionel, Dipanwita, & Silva-Goncalves, 2017) or that there is no relationship or persistence with mental health structures such as emotional symptoms, behavior/management problems, peer problems, and prosocial behavior (Dee & Sievertsen, 2015).…”