Sibling rivalry disorder

This disorder should only be diagnosed if there is a degree of emotional disturbance, usually following the birth of an immediately younger sibling, which is both unusual in degree and associated with abnormalities of social interaction.

Clinically, the child shows abnormally intense negative feelings towards an immediately younger sibling characterized by two or more symptoms of regression: tantrums; sleep difficulties; dysphoria; oppositional or attention-seeking behaviour with one or both parents. Onset is within 6 months of the birth of an immediately younger sibling and the duration is longer than 4 weeks. There are no systematic data on the epidemiology, natural history, and outcome of this condition.

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