Heat rash ?

Cristal • 02/10/17💍💏 05/22/18👶💞

So my Lo been having this “rash” for about a week an a half pretty much like small bumps( not filled with liquid or anything) they are pretty small all over his forehead cheeks and some through his body we live in Texas and is been crazy hot so I assume they’re heat rash bc it gets reddish when we’re outside in the heat but mainly is skin colored. Any similar cases ?