First time mom here, my 13 month old doesn't eat anything, is this a phase?

WELL. my son is 19 months. He use to eat all kinds of things, macaroni, mashed potatoes, chicken noodle soup, rice -n- gravy, ect ... Now IF he eats all he will eat is french fries, chicken nuggets and tator tots, then at that he only takes a bite! He still drinks a bottle and i think that might be a problem of it. Like today all he has eat is 1 tator tot! I don;t see how he doesnt get sick oh and he ate 2 grahm crackers, Then ppl tell me he is fat i don't see it or see how! (which is rude in the first place) You should try to feed her some cereal, cocoa crispies he likes ot fruity pebbles, for the last week he has eaten that everyday but now not wanting it anymoer. I had to buy him some packets to put in his bottle to drink so he gets his nutrients! they are called brainstrong i think.