
I had to start feeding my litter at 2 weeks, as Mom ended up with a ruptured artery inside and emergency surgery so her milk went.
I used the royal canin starter food, mushed up with warmed up full fat goats milk and they went mad for it. They much preferred that mixture rather than just warm water added.
The RC mousse was good too warmed up. If something is warmed up, it makes it more fragrant.
You could also try something like cooked freeflow mince or lambs breast, as that is white fatty.