picky eater!

My 13 month old has decided to go through this phase where he wants to eat absolutely nothing besides yogurt cheese and turkey meat!! I buy all these fun meals for him and end up having to throw them away because he wants nothing to do with him. I have tried all sorts of yummy fruits mangos, plums, kiwi, berries and nothing, I'm not sure if it is a texture thing or what but it stresses me out that he isn't getting the nutrients that he needs. He is already on the smaller side only weighs 19lbs and we are still breastfeeding. Anyone have a pickey eater? What worked for you, I need some advice