Picky eater!

Hey everyone, I'm looking for some advice (I'm a FTM). My son is 13 months old and he doesn't want to eat. He will eat his cereal, yogurt, apple sauce, and refried beans. He still loves his bottle. I've never had a problem with him eating before, we transitioned to table food months ago and were doing really well. He would try everything, now he doesn't want to try anything. this has been going on for a little over a month. He is cutting a tooth, I thought maybe he doesn't want to chew because his gums hurt? On his Dr 's recommendation from his 1 year check up I've been giving him a pediashure a day which he loves. I do really want him to eat age appropriate foods though and I'm not having much luck! I'd love some advice/ opinions. Thank you!