Eating

So my little guy will be 16 months on the 8th and for some reason he hasn’t been eating as much as he used to. It’s been more then 2 weeks that I’ve noticed this. He doesn’t act like he’s starving or hungry but I feel like he barley wants to eat. Like stuff he would tear up like hotdogs but he doesn’t even eat 1 bite now. He has his check up appointment tomorrow so I’m going to bring it up. Also he’ll try and eat weird stuff like his books, paper, baby toothpaste, and other stuff. He know how to open his desitin and lotion and it looks like he try’s to eat it so we have to make sure they’re high up. Is anyone else having problems with their little ones eating?