What are the substances that go from a baby to a mother?

During breastfeeding, various substances transfer from the baby to the mother, primarily through skin-to-skin contact and hormonal signals. These include hormones like oxytocin, which can promote bonding and maternal behaviors, as well as immune factors that may signal the mother's immune system to produce antibodies. Additionally, pheromones from the baby can influence the mother's emotional state and behavior. This exchange enhances the mother-infant bond and supports the baby's health and development.