Behavioural Abnormalities in Children causing alteration in Childs’ function levels causing distress to the child and their parents are described in the chapter. Classification of Childhood Disorders (ICD 10 and based on clinical Course) has been given. Mental Retardation: Definitions, Incidence and Prevalence, Classification, Types, Predisposing factors, Causes, Clinical manifestations, Diagnosis, Management– Hospitalization, Rehabilitation of MR children–Role of Parents and Families, Complications, Prevention of MR–Measures to be taken—in Primary Prevention, Secondary Prevention, Tertiary Prevention; Nursing Management of the MR child, Prognosis has explained in a comprehensive manner. Autism: Definitions, Incidence, Predisposing Factors, Causes, Clinical manifestations, Treatment, Nursing Management. Selective Mutism: Incidence, Causes, Characteristics, Treatment. Speech Disorders: Signs/identification of problems in Language and Speech Development, Management Cluttering Characteristics, Treatment. Fluency Disorders—Unclear Speech, Stuttering/Stammering–Causes, Onset and Development, Characteristics, Types, Treatment, Movement Disorders–Mannerisms. TIC Disorder— Definitions, Incidence and Prevalence, Classification, manifestations, Treatment, Nursing Management. Attention Deficit Hyperactivity Disorder–Etiology, Clinical Features, Clinical Course, Diagnosis, Treatment. Eating Disorders: Classification, Causes, Treatment Modalities, Nursing management. Obesity–Prevalence, Risk factors, Causes, Mechanical Complications due to Obesity, Clinical Diagnosis, Treatment and Prevention. Anorexia Nervosa–Definition, Risk Factors, Causes, Clinical Manifestations, Types–Emaciation–Definition, Causes, Clinical Manifestations, Prevention; Under Weight–Causes, Signs and Symptoms, Treatment Restricting and Binge–eating and Purging–Screening and Diagnosis, Treatment. Bulimia Nervosa—Definition, Risk Factors, Causes, Incidence, Bulimic Cycle, Clinical Manifestations, Categories, Consequences, Complications, Diagnosis, Differences Between Anorexia Nervosa and Bulimia Nervosa, Treatment. Failure to Thrive–Causes, Manifestations, Treatment PICA—Causes, Manifestations, Treatment. Behavioural Problems among Children: Definition, Causes, principles of dealing with Social and Emotional Problems, Parental Guidance and Counseling, Specific Behavioural Problems: Colic Causes and Treatment Breath Holding Spells–Causes, Manifestations, Treatment. Sleep Problems–Newborn to Preschool age—Causes, Manifestations, Treatment for specific sleep problems like Bedtime Resistance, Night Mares, Night Terrors, Somnambulism, Early morning riser. Conduct Disorders—Types, Etiology, Clinical Course, Treatment. Antisocial Disorders–Etiology, Clinical Features, Course and Prognosis. Conversional Syndrome, Passive Rebellion, Spoiling, Jealousy, Selfishness, Hurting Others, Destructiveness, Juvenile Delinquency, Unsocial Behaviour, Head Banging, School refusal, Nail Biting, Violent Behaviour. Anxiety Disorders–General Anxiety Disorders—Risk factors, Causes, Clinical manifestations, Types and Treatment. Phobia Disorders–Specific Phobia. Social Phobia, Panic Disorder, Panic Attacks– Manifestations and Treatment. Temper tantrums, Obsessive Compulsive Disorder, Dissociative Disorder, Mood disorders–Depression, Stubborn, Thumb Sucking, teeth Grinding/Bruxism. Problems in Toilet Training– Enuresis–Incidence, Definition, Causes, Management; Encopresis—Definition, Causes, Diagnosis and Management. Personality disorders–Aggression and Tension, Violent Behaviour, Childhood Schizophrenia— Causes, Symptoms, Management. Child Guidance Clinic –Team and Functions of Team members. Therapeutic Modalities used in Childhood Psychiatric Disorders and Nursing Management of the child with Psychiatric Disorder etc., are explained comprehensively.