As to how to do it...
You can keep them in diapers, put them in pull-ups, switch to undies, or let them run bare-bottomed. Each method works for some kids. No method works for all kids though the last two have the best track records.
You can bribe them with small treats like fruit loops or M&Ms.
You can reward them with sticker charts.
You can not do anything and just expect them to get it without an incentive.
You can make them feel badly about getting the princesses or superheroes on their undies wet.
Again, each works for some kids. None works for all kids.
You really need to evaluate how much time you want to spend, your child's temperment and readiness and pick what methods you want to try. Once you get started, you can always switch if something doesn't seem to work.
at 12:22 PM on Jan. 6, 2009