Kristin Osborne was escorted out of the exhibit hall at McCormick Place on Saturday, she said, because she was carrying an infant. Osborne, 31, knew about the trade show rule that does not allow children under 16, she said, but did not think it would apply to her sleeping, 10-day-old baby wrapped closely to her chest. Osborne left her two other children, ages 2 and 4, at home, but said she has never been kicked out of a place for having an infant.