My 4 month old has been grabbing things in front of him for a couple of weeks now. Last night I put a finger of cutted up apple on the side of my plate nearest him and he picked it up and (as with everything else he gets hold of) put it in his mouth and chomped. He spent a happy half hour chomping, dropping and picking up this piece of apple with obvious enjoyment.
He can sit up by himself for about 10 seconds, or much longer if supported, so that aspect is fine. As long as l avoid food containing gluten is it ok to continue letting him try my food? If so, is there anything else it might be better to avoid until 6 months?