First, do a dry run. You know, days before, give your child a glimpse of jolly ole St. Nick from a safe distance. When you come back for the actual photo, he'll be more familiar with what to expect. Second, carry supplies! Toys and snacks are key. If you're kids hungry...well you know how that goes. Third, distract, put a piece of tape on your child's finger if he gets fidgety. Sometimes that's distracting enough that he'll forget Santa's even there. And finally, put his wish list on a piece of paper and have him hand it over to the jolly one. This places the attention on Santa, not on him!