"off" days during teething?

Petrie is turning 5 months old and he's teething... He's the size of an adult cat (around 10lbs) and he hasn't had the "starving" appetite these last two days like he's had since I got him... All he's done is sleep and mope around.. Do they get almost lethargic like when they teeth? He's my first "real" cat that I've babied and spoiled beyond belief so I've never really paid attention before.. He's eating, peeing, and pooing... He isn't bouncing off the walls like he normally does which is why I'm freaking out.. My bf's mom thinks I'm overreacting (she's been a cat person all her life - and currently has 9 - a stray adopted them 2-3 weeks ago! LOL).. Any input?

it could happen... he is eating thou right??

If he's teething, get some fat, plastic straws and throw a few around for him to chew on.

As Sharky suggested above, make sure he is eating.