Erythema Toxicum rash

Shelby • Married 7 years, had our first boy after trying for 2 years with Male Factor Infertility. Pregnant with #2, due November 2019!

Pediatrician says my poor little dude has erythema toxicum! She said it'll go away in days to weeks, but he's 5 weeks old and no signs of leaving anytime soon. Anyone else's baby have this? It started on his face and I was convinced that it was getting better, then while changing his clothes the night before last I saw that it's spreading down his chest!