My 10 month old baby only wants to eat by himself? How do I feed him?

He used to eat the baby foods like Gerber etc but now at 10 months wouldn't open his mouth for anything at all. He is ready to ead bread pieces or cookie crumbs or cheerios etc if he picks them up but nothing that we want to give in a spoon or by our fingers. This means that he eats very little and then gives up. As a result he remains hungry most of the times and is becoming cranky. Any suggestions? Thanks in advance.