Interview with Many Brown Belfort, the lead researcher at Boston Children’s Hospital. Measuring IQ levels of 1300 3-year-old children, researchers at Boston Children’s Hospital in Massachusetts found those who were breastfed for the first year have higher aptitude of learning language. The lead researcher Mandy Brown Belfort told Healthy Lifestyle that children who received nothing but breast milk for the first year have average of 0.25 percent higher language development levels in a month, which makes 2.5 percent difference in a year. She said the benefit of breast feed goes beyond the IQ level. In certain countries where the water quality is poor, giving formula decreases the survival chance of the infants, she said.