MedicalResearch.com Interview with: Dr Robert Eves Research Associate at Universität Bielefeld Honorary research fellow at the University of Warwick Guest researcher at DIW Berlin MedicalResearch.com: What is the background for this study? Response: When an infant is born their birthweight percentile is often calculated. This indicates how big the infant is relative to other infants born at the same gestational age (weeks of pregnancy). In long-term follow-up of at-risk infants, being born below the 10th percentile has been considered a risk factor for later cognitive development. However, we thought that this above or below the 10th percentile cut-off was unlikely to reflect the true association between birthweight percentiles and later cognitive development. First of all, we thought that it was unlikely that there would be a dramatic difference between someone born at the 9th vs. 11th percentile. Secondly, we wanted to determine if there was a point when birthweight percentiles could get too large (i.e is there a Goldilocks effect, maybe you should not be too small but not too big either) (more…)