I use Kaytee baby bird food when I tube feed as rec by @casportponyI couldnt get the mash through the 5fr my 8fr was supposed to come today but is delayed until Thursday now. I have some kaytee bird formula coming (regular and high fat) that I hope I can fit through the 5fr but I'm not sure if it is really good for ducklings? I think I have seen it suggested on this forum somewhere but I can't find it.
He is holding weight with the syringe feeding but it's stressful and I think the tube will be easier on him if I can get it sorted out.