With the elimination of confounding variables such as intrauterine growth, social class, and maternal cognitive abilities. They did find a small positive correlation between the presences of breast milk in a particular gene known as FADS2. When breast milk is present within FADS2 the average IQ score goes up seven points. FADS2 is comprise of two genotypes; C and G. Roughly 90% of the human population carry the C genotype of FADS2 and were associated with higher IQ. “Breastfeeding had no effect on the IQ of the 10% of children who had the G versions of the gene; however their outcomes were made no worse by breastfeeding. (Capsi,