The growing problem of suicidal behaviours among children and adolescents poses a major challenge for society. It is important to notice and identify warning signs that may indicate a mental health crisis, and to implement appropriate management. This paper provides guidance for primary care physicians on the problem of mental health crisis in paediatric patients. The aim of the study was to present diagnostic and therapeutic approaches in children and adolescents with mental health deterioration. We present a new model of mental health care system for children and adolescents in Poland based on reference level I, II, and III centres. The study used police statistics, guidelines, research papers and expert opinions. A retrospective analysis of statistical data was conducted, based on which an increasing number of suicide attempts among children and adolescents was observed. It was also found that girls were more likely to commit suicide attempts, whereas completed suicides were more common among boys. Furthermore, warning signs of a mental health crisis, the so-called red flags, were identified, and a list of current child and adolescent mental health centres with contact details attached. The escalating phenomenon of suicidal behaviours among children and, at the same time, the limited access to child psychiatry specialists makes the education of paediatricians and the patient’s immediate environment essential. Vigilant medical staff is often the only way to provide patients and their relatives with prompt and professional care.