Hi, I have been trying to introduce coarser(sp)...

Hi, I have been trying to introduce coarser(sp) foods into DS diet. Tonight I gave him pumpkin, potato & couscous (mashed), he had 1 mouthful gagged & vomited everywhere. I have been trying to introduce these foods for a while now & he always seems to Gag on it & I end up giving him pureed food. Can anyone help me.... I am really scared of him choking too, I know he needs to learn to chew & eat properly, so how can I help him to do it? Thanks for reading...........