Benjamin Spock later endorsed it in his 1968 book Baby and Child Care.[2]#2 It's also the guiding principle for more modern methods like Montessori toilet training and "gentle" potty training.

or the birth of a new baby. But you don’t need to abandon potty or toilet practice altogether. Pause from focusing on removing the nappies until your child is feeling better or motivated.

“If you’re moving house or there’s a new baby on the way ... so you could talk about their toilet habits. Singing and games around potty training are also a great idea.