Between the ages of 7 and 10 months, a child has a fear of strangers, which is completely normal, but if it continues before the age of 5, selective mutism (inability to communicate with strangers or unfamiliar environments, where he is expected to speak) ) and if this problem continues and changes before the age of 18, we will diagnose social anxiety and if it continues after this age, we will diagnose avoidant personality disorder.