Linda, first of all don't feel bad.....it happens to the most well tended babies......

Like Kirsty says, there may be a touch of fungal too, so chose a cream that has some anti-fungal as well.

To heal the soreness you need a mix of the antifungal and the barrier cream.

Plus nappy free time, as you're doing.....

It seems to vary from baby to baby too......Olivia used to get shocking bum rash and zinc and benzoin worked on her, but it has no effect on Charlie at all.....for him I use Canestan topped with PawPaw........go figure......LOL!