Kiddy World Publishing

year of pub­li­ca­ti­onISBNauthor(s)title
2013978-94-91882-00-5Hetty van de RijtWonder Weeks (The Wonder Weeks)
2014978-94-91882-02-9Frans X. Plooij · Hetty, van de RijtLes semaines miracle: Comment stimuler le développement de votre bébé durant les 20 premiers mois primordiaux de sa vie et transformer ses 10 grandes ... bonds magiques vers l’avant (French Edition)
  ''978-94-91882-07-4Xaviera PlasMy Wonder Weeks Journal
2017978-94-91882-16-6Frans X. Plooij · Hetty van de RijtThe Wonder Weeks: How to Stimulate Your Baby's Mental Development and Help Him Turn His 10 Predictable, Great, Fussy Phases into Magical Leaps Forward(5th Edition)