It's more important, right now, to get a drop or two of sulmet water in it's beak every hour or so. They can go longer without food than they can water. When ready to try feeding it, I make scrambled egg, and get a tiny pinch and put it in front of beak, just like I do the water, and the chick will normally chew/swallow it. But, for now, especially since it was eating this morning, just try and get some fluids in it.