Good for you

I'd suggest buying some meal worms (If that's too much money, maybe just find some? I know how much the worms cost here, it's ghastly) and blending them or atleast mushing them up, cuz I know that robins regurgitate thier food, and just feed him that

My aunt has a bunch of baby robins where she lives, and I've watched them being fed. It didn't take much, they are always hungry