The Impacts of Breastfeeding on Cognitive Development

There are two types of studies that I would pull out most consistently as this is where we want to look to the literature in terms of impacts. Those kinds of studies tend to show quite limited impacts of breastfeeding. So those are a bit easier to run. It's not a randomized trial. You want to think about there's two siblings, same family. One is breastfed. One is not.