Is my cat chubby?

I’ve had a friend come over and she likes to call my tux cat “fat kitty” and it’s making me realize he might be getting bigger and it’s making me so anxious and that I’m a shitty owner. I told my mom about it and she said he’s not fat my ginger cat is just skinny so it makes him look bigger but I don’t think so and it’s worrying me (Photos in comments)