Best-selling author Marie Kondo believes she has helped many habitual sufferers of untidiness bring order — and even joy — to their lives with her fine-tuned cleaning method, arguably one of the best out there today.

But a new challenge has emerged for the diminutive decluttering master. As her fans used to say: "Just wait until she has kids!"

"I have to admit, it's not so easy to keep my house clean anymore because of my daughter," Kondo, who gave birth to a baby girl last July, said in a recent interview.