Our DS4 has not been officially identified as gifted but he didn't talk until just before 2. He said "in" and "out". We knew he knew his colors, letters, numbers and shapes at around 9-10 months old but we were still amazed when about a week after he turned 2, he read the freeway signs (just the letters and numbers at first) and cigarette and gas prices. About a couple months after that, not only was he talking in short sentences, he was also reading and writing. Even now, he speaks and asks questions appropriately especially with adults and has a huge vocabulary but sometimes he has a difficult time putting his thoughts into words especially the more complex thoughts.