sick bab…ty, says Lisa Rosh, a professor of management at Lehman College of the City University of New York. For example, at one company Rosh studied, a woman introduced herself to her colleagues not by mentioning her credentials and education, but by talking about how she’d been awake the previous night caring for her sick baby. It took her months to reestablish her credibility. Being overly familiar at work, Rosh says, can ov…