They justify bad behaviour

Bullies may attempt to shift blame to the victim rather than themselves. Licensed professional counsellor Jay Clark says a behaviour that tends to correlate with bullying is when a child fails to recognise their actions may be contributing to a problem. Emotions may quickly escalate in intensity in a child with bullying tendencies, and they feel justified in treating another child badly. They may feel the other child ‘has it coming’.
They have friends who act aggressively

Children who bully often don’t have a shortage of friends. In reality, they usually have a large network of friends and a smaller, intimate group that encourages bullying behaviour, according to the Pacer Centre. No parent wants to find out their child is ill-behaved towards other students. However, if your child’s friends are mean towards other kids, or if they engage in some other type of bullying, your child might be participating in bullying as well.
Now discover the signs your child may display if he or she is the one being bullied.
They have difficulty sleeping

A 2011 study by the University of Michigan, published in the Sleep Medicine journal, revealed children with aggressive or bullying tendencies were twice as likely to exhibit sleep-disordered breathing problems like snoring or daytime sleepiness. While this study doesn’t prove sleep disorders actually cause bullying, it does show a possible link between sleep problems and contentious behaviour. A lack of sleep impairs mood and decision-making. If you think your child has sleep issues, a visit to the doctor might be a beneficial step to curb potential bullying.