At 10.5 months here Katie definitely cannot do anything with a spoon, but she can use those fingers! I think I started around 8 months giving her things like cheerios, toast, cheese, soft fruits and veggies - I know some people do it even earlier. I think the spoon feeding is still a long ways off, though I do let Katie try every now and then (not that we get anywhere with that). As for amount, as long as he's gaining weight ok and doing well with his milk feeds, I would just follow his lead with the solids. If he's acting like he wants more try giving it to him and see how he does, otherwise, he's fine.