I have 5 kids, all have developed language differently. My oldest (and only formally identified as gifted) didn't speak 2 words together until after he was 2. My second child (who is now 8) is almost certainly gifted, but we haven't tested him. He was speaking 2 word sentences clearly at 12 months. His teacher at daycare, the year he turned 2, said that she loved having him in her class because she could have an actual conversation with him. We were even stopped by an airplane captain in an airport once because he overheard him talking and wanted to know how old he was. He was in disbelief when I told him 2. My other three children have been more "normal" in their speech develpment.