don't touch it cuz it spreads so don't kiss where they are and then kiss somewhere else. turn on your shower and let the bathroom get steamy and just sit in there with him. sometimes it happens because of the oils on their faces so just make sure you're washing his face really good whenever he takes a bath or after he breastfeeds cuz the oils on your body too can cause it.

changing baby wash or detergent

try using aveeno body wash when u bathe him.