Ikea brings out the best in people. I saw a mom once yelling and screaming at her little boy because he was doing exactly what little boys do: explore stuff. He wasn't do anything bad, he was just crawling under furniture and stuff. I was a kid once, I remember doing that too! 20 minutes later I saw her literally dragging the poor kid by one arm. She was walking *fast* and the poor guy must have been having a heck of a time trying to keep up with those little legs. I felt bad for him, too.
Of course just to get from the entrance of Ikea to the registers is an expedition, but the do have a little courtesy child care area, at least in the Emeryville CA store, probably for this very reason.