I think she's talking about when a babies feeding is advancing, and the RN is trying wean the IV fluids.
Again, I would request an order, but if you know how much fluids/kg the docs want that day, you can calculate it.
Example: they want 100cc/k/d, the kiddo weighs 1500gms=150cc in 24hrs. IV rate=6.3cc (rounded off). If you're feeding q3h, that's 18.5q3h. The baby gets 4cc gavage fdg, 18.5minus 4 divided by 3=hourly rate. I came up w/ 4.9cc. When you increase the feeding, recalculate.
I HOPE that's what your asking!!