A new study suggests that babies who are breast-fed or bottle-fed to a schedule do not perform academically as well at school as their demand-fed peers. The finding is based on the results of IQ tests and school-based SATs tests carried out between the ages of five and 14, which show that demand-feeding was associated with higher IQ scores. The IQ scores of eight-year-old children who had been demand-fed as babies were between four and five points higher than the scores of schedule-fed children, says the new study.