Sally Kohn: I want to make one point about the sibling study that you raised. That was the study that Amy Tutur leaned on in her defense of not breastfeeding because the sibling study finds very small effects. It is true that the mother's health constant in those situations, but what's not a whole bit, it's not random. They don't tell a mom, why don't you breastfeed one of the kids and not the other? We don't know the reason and that could have an effect. She says we always want to be interrogating all the kinds of studies that we have.Kohn: What are some of the reasons why you might breastfeed one kid