New research from the University of Adelaide shows that weight gain and increased head size in the first month of a baby’s life is linked to a higher IQ at early school age. The study was led by University of Adelaide Public Health researchers, who analysed data from more than 13,800 children who were born full-term. The results, published in the international journal Pediatrics, show that babies who put on 40% of their birthweight in the first four weeks had an IQ 1.5 points higher by the time they were six years of age, compared with babies who only put on 15% of their birthweight.