Baby-sitters must be hard to come by these days. That’s the only possible explanation for why Kelly found herself entertaining the small child next to her during a showing of the R-rated movie “Ted.” The encounter raised all kinds of questions. For example: why was this child sitting in a stroller that was positioned to block Kelly’s seat? Why didn’t Regal Cinemas staff do anything about the stroller? Why didn’t the child’s mother notice or care that the kid was yapping to Kelly? Then, of course, there’s the key question on which this entire problem hinges: why bring a toddler with you to an R-rated movie?