So, for example, if they notice a female customer purchased a pregnancy test and later stocked up on vitamin supplements and anti-stretch mark lotion, Target would assume she was pregnant and send her coupons for baby furniture and diaper genies.
Typically, this works out well for all concerned. Consumers get discounts on products they need and Target sees an increase in sales.
In the case of one pregnant high school student, the results were less expected. The young woman had not yet told her parents of her pregnancy, so when Target's mailer of deals on cribs and baby clothes arrived, her father became suspicious and started asking questions.