Severity of anger can be predicted as early as 14 months indicated by low levels of effortful control on simulated tasks. This trait normally remains stable throughout development- without intervention. 

Arizona State University

While anger is expressed differently and for diffferent reasons, this emotion begins to apppear during the toddler years. 

Anger and Development 

Matthys, & Lochman, J. E. (2017). Oppositional defiant disorder and conduct disorder in childhood (Second edition.). Wiley Blackwell.


Oppositional defiant disorder and conduct disorder in childhood 

Physical aggression is often replaced with verbal aggression by age three. However, as children go through development they are expected to acquire the self and social awareness to govern the way they elicit anger. 

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