Sharlene,
Any reason why he doesn't wanna chew? Like another mummy mentioned, possibly a sore mouth with an ulcer? Teething? Sore throat? IF he's ok and is just deciding to play up a bit, perhaps get him interested in chewing again by giving him something easy to bite/dissolve in mouth like a biscuit or puff or bread or something?
My boy doesn't take a heavy breakfast, as he has a milk feed terribly early in the morning. I give him a big pot of yoghurt (adult size portion), and a whole fruit - blended if it's too crunchy for him to manage. These few days he's been taking two pots of yoghurt instead of one, or one pot of yoghurt and a chunk of cheese. All depends on his mood liao. sigh.