This looks like heat rash as SG weather is getting hot. Please try Cetaphil baby cream. It should be effective.
Also, avoid thick clothing for LO since weather now in SG is getting hot
Uniqlo sells singlet or those LO clothes with ventilation.
Have u tried California baby cream or cetaphil cream?
Using aveeno for him and we put him in an aircon room..
Could be eczema from hot weather
farhana