I thought that DD didn't even talk much before a year, though maybe it was just one word etc. But by the time she was 2, she had 2000 words. She could name 50 different animals in the zoo by 18 months. And was speaking in 3 word sentences clearly.

I think there have been others here that had similar, not gradual build from birth, but a sudden deluge after the year mark.

Ren