Summary
A major study of nearly 10 million American siblings suggests birth order may be associated with differences in more than 150 health conditions. Researchers analyzed medical records over two decades and found that second-born children showed higher rates of migraines, shingles, gastrointestinal disorders and substance use disorders. First-born children, meanwhile, had greater rates of neurodevelopmental conditions, including autism, ADHD, Tourette’s syndrome and OCD, along with more allergies. The findings highlight possible links between birth order and health, although researchers stress that associations do not prove cause and effect. Environmental, genetic and family factors may also contribute to these observed differences.
Fox News
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