Birth size, school performance and family social position: a study of 650,000 children.

"Competing interests The authors declare no competing interests."

"Funding M.M. was supported by the ERC Synergy grant BIOSFER (#101071773) and the Strategic Research Council (SRC), FLUX consortium, decision numbers: 345130 and 345131. P.M. was supported by the Academy of Finland (#308247, # 345219), and the European Research Council under the European Union’s Horizon 2020 research and innovation programme (grant agreement #101019329). M.M. and P.M. were supported by grants to the Max Planck – University of Helsinki Center from the Jane and Aatos Erkko Foundation, the Max Planck Society, University of Helsinki, and the Cities of Helsinki, Vantaa and Espoo. The study does not necessarily reflect the Commission’s views and in no way anticipates the Commission’s future policy in this area. The funders had no role in the study design, data collection and analysis, decision to publish, or preparation of the manuscript. Open Access funding provided by University of Helsinki including Helsinki University Central Hospital."