How target tracks its customers. Target is so good at it that the company knew a teenage girl was pregnant before her own father. - if i have to be stalked by someone, I would choose Target. At least I would save money on things I already buy there.
This will come in handy! First month is the month they're conceived and the one beside it is the approximate month of birth, if they're born full term. Handy guide if you want to try to have a baby in a specific month.