Abstract: An advent type calendar used to inform or educate the user as to milestones of the human fetal development process. Tabs are pre-formed in, and peel back from, a top surface of the calendar to reveal messages which inform the user as to the current development level of the human fetus. Each tab is labelled with the week corresponding to the message below relating to human fetal development. The calendar of the present invention may also be applied to educate the user as to developmental progress of other time constrained development processes.