Baby Teeth

I was helping Adrian brush her teeth on Christmas Eve and this is what I found. If you look behind her bottom row of teeth you can see a new tooth coming in behind them. I cannot believe she is old enough to be getting her permanent teeth already! I've never heard of teeth coming in before the other ones are loose (hers doesn't even budge yet), but apparently it's not that uncommon. We will just wait a month or so and if her baby tooth doesn't start to loosen up, we'll call the dentist.