For what it's worth, the only one of mine who walked at 12 months was Kevin; Daisy and Lilah both walked at around 14 months, and Joey and Annabelle both didn't walk until 15+ months. And, yeah, you'll find that they'll take a few steps one day and then not again for a while . . . sometimes it takes weeks after those very first steps before they become bona fide walkers. Sounds to me like Callie is right on target :)