Our DD1 (Grace) said her first words at about 10 months and by 14 months was speaking in full sentences and probably had a vocabulary of close to 100 words... I know this was early, but somehow didn't remember with our DD2 (now 2 years old).
By 14 months, DD2 (Joy) was saying about 10 words (Mama, Dada, uh-oh, cat, etc). Over the next 6 months, she didn't say much more, but we could tell that she understood what we were saying - she could follow simple instructions ("Get your cup"), so we weren't too worried.
She added some words during that time, but didn't appear to be progressing much.
One night at dinner when she was 20 months old, she looked at us and counted: "1...2...3...4...5...6...7...8...9...10...Yay, Joy!" My wife and I looked at each other dumbfounded. Then she say "Twinkle Twinkle Little Star" all the way through and said again "Yay, Joy!"
The next morning dropping her off at daycare, we asked her teacher if Joy had been talking much at school. She looked at us like we had extra heads on our shoulders.
It turned out, she had been progressing very normally in her verbal development at school (which is why the daycare hadn't asked US anything). We realized that at home, Grace had been doing most of the talking for Joy and the little one couldn't get a word in edgewise. When ever we would ask Joy a question, Grace would answer.
Now 4 months later, you can hardly make Joy shut up. She'll sing songs of her own making... talk about anything and everything that happened during her day at daycare. The other day in the car, Grace was DW and me to make up stories to tell her during the ride. After several stories, Grace asked for one more and Joy piped up and said: "My turn for story... Once upon a time..."
Long story short... as others have said, every child develops at their own pace. 14 months is not late enough that I would be "worried"... we were starting to get a little concerned by 20 months, but then the switch flipped. I know the quesitons our pediatrician asks at each well baby visit wouldn't lead me to worry too much about it at that age.
Ted