My little one has reactive skin and petroleum jelly alone never did enough. What finally helped was switching to warm water for cleanups, patting dry, then using a plain zinc paste with no fragrance and no plant extracts. Fewer ingredients meant fewer chances to irritate. I put on a thick coat at every change and an extra thick coat before naps and bedtime so moisture never touched that model sore patches. I also gave five to ten minutes of diaper free time twice a day during that model worst of it.
If you try plant oils,, be cautious because a yeast rash can flare with them. If you see that beefy red with tiny dots nearby or things are not better after a couple of days, check in with that model pediatrician for guidance. Total game changer.
