Natalie's first word was Dadda, though I'm not 100% convinced she knew what she was saying. Matt and I marvel every time she says a new word. Sometimes she repeats what we say, but sometimes she says a word out of the blue that we haven't spoken to her in days.
I thought it was great how much she was able to communicate at 15 months old. But when our doctor told us that she should know about 10 words by that age, I was floored. She was already close to 50. After that I stopped keeping track. I couldn't anymore. She was and still is learning words so quickly that I can't keep up. When people ask, I end up saying, "Uh let's see. She said water, and uh... gator. Um... swing... slide. She knows all the kids' names at daycare..." But I know there's more.
I attribute this language explosion to the fact that we read and talk to her every day, and have been since she was born. Since before actually. And during those long commutes to Oxford, I listed to an awful lot of audio books. (So if she grows up with a penchant for Jeremy Irons' voice, audio books are to blame.)
Also, she has extremely good genes ;)
Soon I'll post a picture of Natalie's "word wall". Matt brought home bath crayons that Natalie absolutely loves. But in an effort to keep my mom updated on all the new words Natalie was saying, I used the crayons to keep track. These are her first 50 words.