You have been hired by a research institution to design a study to examine the effects of a drug (used by physicians to control expectant mothers' nausea over the course of a pregnancy) on infant hear

You have been hired by a research institution to design a study to examine the effects of a drug (used by physicians to control expectant mothers' nausea over the course of a pregnancy) on infant hearing at birth, 6 months and one year. Briefly explain how you might do this using a cross-sectional design, noting benefits and drawbacks. Then explain what a longitudinal design is and how it would improve on your original approach.