If you are having a hard time getting that painful stuff to go away first try to use the creams.  When  you use the cream change the diaper more often then you normally would and let your baby dry completely before putting a new diaper on, and apply the cream every time you change your baby.  If even this isn’t helping, I have heard of using a warm damp towel with no soap or anything on it for just pee pee diapers and for poop diapers, using damp warm towel with Dove bar soap (the kind for sensitive skin).  After  you have done this, pat your baby’s bottom dry and dab the Desitin and let it dry completely before putting the diaper back on.