My confinement lady taught me to use young bitter gourd tea. It has a cooling effect n she did not allow me to use creams on babies as she felt there's too much chemical. You can buy these tea bags (小苦瓜茶带 - green box with 30 sachets and shoukd cost less than $6) from supermarket or medical halls n make a cup of tea as if you're drinking. Each time you use, pour into a container n dilute with water. Use it to clean the baby's sensitive areas like the joints n buttock (each time the LO change diaper). My girl never had nappy rash at all. When her body starts to have trashes or prickly heat, she'll bath her in a tub of diluted tea. Please do not use soap as it has a drying effect. It's cheap n effective for me. 1 sachet a day for buttock is sufficient. Hope this will help.
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