Study links birth order to autism and hyperactivity risks
A comprehensive study reveals that a child's birth order within the family is associated with differing probabilities of developing hundreds of diseases and disorders, including ADHD and autism spectrum disorder. The findings show that first-born children are more prone to ADHD, autism, Tourette syndrome, obsessive-compulsive disorder, and allergies, while second-born children are more susceptible to gastrointestinal issues, migraines, and an increased risk of substance use disorders. The study suggests that these differences may stem from biological, immunological, and social factors, and underscores the need for further research to understand the underlying mechanisms behind them.
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