This article suggests it could be valuable to breastfeed; even if you are formula feeding. The act of breastfeeding or #allattateli garners healthy response in newborns. There is more to it than just the milk!
"Breastfeeding mothers show a greater level of [brain] responses to baby's cry compared with formula-feeding mothers in the first month postpartum," Kim said. "It's just really interesting. We don't know if it's the act of breastfeeding or the oxytocin or any other factor."