Quoting Krystal McCracken:" My baby just turned one the 4th, and I'm not sure if she is on the right track for her age as far as ... [snip!] ... other than what I already do, say them over and over, and talk to her all the time, telling her what everything is? Thanks!"
Every kid seriously develops at their own pace. My two kids are night and day.
With DS, I would constantly read to him while he sat in his Bumbo. Each night, I read at least 5 books to him and talked to him all the time because I heard it helps with speech and stuff. At 12 months, he had no words and at 2 years, he had 2-5 words. He had a speech delay and now at 3 1/2, it's gotten better and he is talking in sentences, but I think he has a speech impediment. I have to call his pedi real soon. What helped him develop his speech was being around other children.
With DD, on the other hand, has been an early talker. I hate to admit it, but I rarely read to her. I'm terrible, I know. I did talk to her a lot, though and she had her older brother talking to her too. At 12 months, she was saying 16 words and she turned 2 last month and she is speaking in 5-7 word sentences.
Obviously my 3 year's thinking/vocab is more in depth than the 2 year old, but kids really do learn at their own pace and in different ways.