Signs of giftedness
When they seem to pick up everything quickly.
With Abbey we knew for a long time she was gifted. She hit her milestones early, and seemed to understand complex ideas easily enough.
For children who are school aged, you can ask your school to do an evaluation. They include in this test an IQ test.
My husband and I were quite surprised when Abbey's IQ came back.
For some strange reason they don't start the gifted program in our district until 2nd grade, so she's the first kid in first grade. I'm sure there will be more though by next year.