Birth order and health links
A recent study has shown that a child's birth order within the family is statistically linked to the risks of developing various diseases. The first-born child is more susceptible to neurodevelopmental disorders such as autism, ADHD, and Tourette syndrome, as well as immune and allergic conditions like asthma and allergic rhinitis. Conversely, the second child has higher chances of developing substance use disorders and migraines, while older children are more prone to growth problems and allergies. The study confirms that birth order is one factor among many that influence health outcomes. It is not used for individual predictions, but understanding it helps in recognizing how early family environment can impact disease risks.
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