Strøm M, et al. - Using data from The Lifestyle During Pregnancy Study 1782 mother-child pairs sampled from the Danish National Birth Cohort (n=101,042), researchers examined the impact of breastfeeding on child IQ at 5 years of age while taking maternal IQ and other relevant factors into account. The Wechsler Primary and Preschool Scales of Intelligence-Revised evaluated child IQ at age 5. Wechsler Adult Intelligence Scale and Raven's Standard Progressive Matrices evaluated maternal intelligence on the same occasion. There was no involvement of patients in this research. Investigators observed that breastfeeding time of 1 month or shorter than longer periods was linked to roughly three points reduced IQ, but there was no proof of a dose-response relationship in this prospective birth cohort where they could adjust for some of the most critical confounders, including maternal intelligence.