My baby wont eat!

Hi Slovie
I have a 13 month old who used to be a great eater. I started him on solids at about 6 months and until now he was willing to try anything I put in front of him. In the last month he has rejected almost anything I offer him, every time I try to feed him something healthy and solid he turns his head without even trying it, if he does try, he'll spit it out immediately.  He will only eat yogurt, Apple sauce and Materna with baby cereal, he also likes anything sweet and Bamba (Israeli penut snack), Im a bit worried because he's also been a bit sick and recently lost 200 Grams, he weighs approx 22 LBS (a nightmare for a Jewish mom)
what can I do? is this normal?

Thanks for your time

Miri K.