This child is being quarrelsome.
The definition of quarrelsome is someone who is prone to getting into arguments or fights.
A bully on the playground who always starts fights is an example of someone who would be described as quarrelsome.
inclined or ready to quarrel
- Given to quarreling; contentious. See Synonyms at argumentative.
- Marked by quarreling.
(comparative more quarrelsome, superlative most quarrelsome)
quarrel +"Ž -some