That sounds like good advice from someone who has lived through the experience. Good thing your daughters-in-law were open to taking that advice.
I never told her. She had a year of nursing school, and the brainwashing they do makes her think that a DR is god.
Just used good old fashion sense and what worked for generations. Baby powder is nothing but perfumed cornstarch nowadays. And those disposable diapers trap wetness and heat and cause diaper rash.
My boys had cloth diapers and training pants.