There are two prominent books that correspond to your request, as both use the phrase "educar en el feminismo" as part of their title or description. by Iria Marañón
This is likely the book you are looking for if the title is exact. It is an educational guide focused on breaking gender stereotypes from a young age.
Often searched with this title, this "feminist manifesto" is written as a personal letter. Educar en el feminismo - WordPress.com
: It provides tools for parents and teachers to raise "free" children rather than "brave" or "obedient" ones, advocating for "coeducation" where no activity or trait is gender-locked.
: The book explores how cultural references and games train children to behave according to their gender—pink for girls (submissiveness) and blue for boys (strength).
: You can find it at retailers like Amazon or directly through Plataforma Editorial .
by Chimamanda Ngozi Adichie