The study has a number of limitations and…

This study was supported by award no. 1R01MH137646-01 from the National Institute of Mental Health and the National Institutes of Health to S.A.K. and A.R. The funders had no role in study design, data collection or analysis, decision to publish or preparation of the manuscript. Birth order and disease risk across the human phenome – https://www.nature.com/articles/s44360-026-00177-z#Abs1

I’m a first-born.

YIKES.