Let's assume that all butts are different.
I myself am allergic to chemicals, e.g. the washing powder (I smell it on the clothes and it irritates my skin) that's why I use amway for almost 20 years - it doesn't leave a smell and doesn't make my skin peal off if I happen to wash with hands.
When my child was a newborn, his skin got red in pampers premium care. Nothing like that with Moony or Merries.
In Russia they are available in almost every drugstore or baby-store.
I will probably bring the full suitcase of them next time I go to Russia.
They cost about 18chf there.