Is this for real?

I've been doing the Baby Signing Time videos with Josie, in hopes that she can start communicating with me a little earlier. Several of my nieces and nephews were using signs before they could talk and it helped a ton, so I thought I'd try it out. I really like the videos, and if nothing else, it gives me 20 minutes of me time while she watches it.
A couple of days ago, I had Josie in her chair, feeding her, and there was a bottle on the table by her. She stopped eating, looked at the bottle and did the sign for milk. A little bit in shock, I handed her the bottle. She took a drink and then we continued eating. I just sat there wondering if she knew what she was doing or if it was a fluke. Then the next day she was really fussy while I was getting her ready to eat. I put her in her chair and told her it was time to eat, and showed her the sign for eat. She calmed right down and waited for her food. It seems much to soon for her to really be understanding and even USING the signs. All I have to say is, Is this for real???

As of yesterday, Josie is officially a cruiser. She's figured out how to move along the couch when she pulls herself up. And yesterday she pulled herself up on one toy and scooted from one big toy to the next. They were all pretty close together, but still. Silly Baby...