Birth order linked to 150 health conditions in study of 10 million American siblings
Birth order linked to 150 health conditions in study of 10 million American siblings

First-born children showed higher rates of autism, ADHD and food allergies, while second-born siblings faced more substance use disorders and migraines, according to a study of 10 million American siblings.

The research found associations between birth order and a range of health conditions across the two groups.

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