First tooth

So, yesterday evening, while I was supposed to be paying attention to the dinner conversation going on around me at enrichment, I was really paying attention to Sylvia and the little hard thing sticking slightly out of her bottom gum. I couldn't see to be absolutely sure it's a tooth (especially because any time I try to look Sylvia just thinks I'm playing with her tongue or something so she sticks it farther out, blocking my view of her gum) but I'm sure in a few days it'll be quite obvious. Guess this is why she was cranky and had a hard time sleeping a few nights ago.