For heat rashes powder is best - moisturisers or barriers etc will tend to exacerbate them. Cornflour - great. Cornflour with about 1% zinc oxide powder - even better. This is the active ingredient in Curash powder and most nappy rash cremes (eg: sudocream), and all of the natural sunscreens as well. Personally I prefer not to use the commercial products like curash because of the synthetic fragrances and other crap in them, but it's pretty easy to make yourself.
If you are in Sydney and near Marrickville, New Directions stocks zinc oxide, or you can also order online.
The biggest thing is to try to prevent sweating as heat rashes are prevalent when moisture doesn't evaporate in high humidity. Natural fibre clothing will help, as will wearing as little clothing as possible. Putting a cotton cloth in the pram and car seat will help as it reduces the contact with synthetics, as will turning on any air-con before getting in the car. If you have air-con at home, use it to dehumidify the room your DD is in as much as possible.
Interesting thread, I was just wondering about this. My 5 week old has terrible heat rash, especially after he has been in the HAB. Doesn't help that we live in Nth QLD and no word of a lie it's been 90% humidity the last few days.
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