If children are attending the festival itself and going to venues, they do need a wristband no matter how young they are, as they would still be counted towards legal occupancy at the venues. Wristbands are required for all venues, including all-ages venues, the museum, and, any non-childrens' programming. Wristbands for children are the same price as those for adults because, as part of our mission, we're trying to pay the artists fairly for playing.
There is one venue for children's programming that will be free all day, no wristbands required, which is Everyday Joe's. You can see the schedule for that venue here: http://focomx.focoma.org/venues/everyday-joes