I have a 7 month old that only eats puree's and bottles. Today I gave her a cookie and she threw it on the floor. I tried again and broke off a small piece and put it in her mouth and after that she held onto the cookie and was sucking on it and such.

He probably just hasn't figured out that he needs to put it in his mouth yet. I would suggest from my experience today, put it on the tray and show them to him, put one in his mouth and hopefully he will associate it with being food.

Good Luck!