Kitten lost a tooth. Is this normal?

I have a kitten that's approaching 6 months in age. Today, after I got home from work, I noticed that one of his teeth appears to be missing. His teeth used to be symmetrical, but now they're not. He doesn't seem bothered at all by it, but I still want to know. Included is a picture of the side with the missing tooth. You can tell where it was because the area is all red, though not bleeding at the moment. The other side appears to have two fangs right beside each other, coming from the top. So I'm suspecting he's just losing his baby teeth like humans do, but the vet is currently closed as it's past midnight (I work closing shifts), hence why I'm asking the internet.