The Supplemental Nursing System (SNS) is a feeding tube device to provide babies long-term supplemental feedings at the breast. When a baby is at breast over a period of days or weeks, a hormonal mechanism is triggered that causes milk to be produced. The SNS can also be used for: premature babies, inducing lactation, adoption, keeping special-needs babies at the breast, ineffective nursers, failure-to-thrive babies, low-milk supply or relactating mothers and a teaching tool to "fingerfed" babies who have had difficulty latching onto the breast. Sterile packaging Medela part 00901S. The Supplemental Nursing System is a personal use product in sterile packaging so it cannot be returned or exchanged due to health department regulations.