I noticed first, as 'at-home mom'! I had my educated suspicions anyway that they probably would be gifted, given my husband's brain and the history of both of our families - but then from very early, there were the obvious signs. My husband was less attuned, being one of those fortunate 'successful gifted' students within his normal school framework. To be honest, my suspicions were first confirmed by absolute strangers - while I would be pushing both of my tiny children along in a shopping cart at any given store, for example. People would stop and comment on how alert they both were at such young ages. I remember one man asking, "Are they gifted?" And I just replied, "Probably"...! And our Dr. told me up front that my first-born was going to be 'very smart'.