Closet Dividers

I made this for the baby that is rapidly growing in my belly. He is only 22 weeks along right now... and I'm itching to make him stuff. I made these dividers for the closet to sort the clothes from 0-3, 3-6, 6-9. 9-12 months. I did see this idea somewhere... but I honestly can't remember where?! It may have been a book I was browsing in some crafty section in a bookstore.