I'm sorry I didn't see your question until now. An SNS refers to supplemental nursing system. It's this tube you can tape to your breast or finger so your LO doesn't get too used to the bottle. Women who need help stimulating the breast use them taped to their nipple so newborns get that milk comes from there. I used it taped to my finger in the hospital and mt breast when I had mastitis. Here's a link. Sorry I can't make it clicky. It totally sucks but it helps with nipple and flow confusion. GL I'd be as heartbroken as you.
https://www.medelabreastfeedingus.com/products/51/supplementalnursingsystemsns
And I see my hyphens are getting removed. If you look at the Medea site, it'll tell you about it.

Then and now. How did my boy get so big?
Re: WhitEm14: