I don't think its odd at all. From the day my daughters were born, I kept a memory box for each of them. It contains photographs, first shoes, lock of hair, birthday/christmas cards, newspaper from the day they were born, favourite teddy, favourite outfit, first drawing, school report cards, certificates, coins etc, etc! I want them to see all their accomplishments, milestones and to show how much they are loved. When they are older, I plan to give them each their box of treasured memories.