You can try Drapolene cream(bought from Mannings/Watsons, a pink toothpaste-like tubing), $40-50.
I use it when my daughter's pat got red in the first 2 week of life since her skin is too thin in this newborn period.
I used 六一散 initially as told by the older people, but not useful.
Then I use Drapolene (told by nurse in Queen Mary Hospital during follow up), the redness gone very fast, it's really useful, try try!
未用尿布前,好多朋友都認為用尿布都一樣會有pat pat 紅既情況出現,但家中的老人家就次次見到BB pat pat 紅都叫我同BB用尿布,加上我個工人都贊成用尿布,不過,用左之後,BB個pat pat真係好左好多,有時,見pat pat有D紅時,用一次mustela barrier cream搽左,下次換尿布時就無再紅,亦唔洗次次換尿布/尿片用cream,唉......用尿布最煩就是成日要check,又要洗,又要地方曬(春天時就更要出動乾衣機)......但唔到自己唔服......唉......