FInd a spoon that isn't too too shallow and get either a plate with a lit or a bowl thatisn't too deep.
Theo has used his own fork and spoon since 12 months because he just wanted to try and seemed to pick it up pretty easily. But I am not sure if it is down to the spoons and bowls or not. But i know he does do better with a shallow bowl, a plate with a lip and a spoon with a bit of depth to it.
HTH