1 Month Old Body Rash?

Taylor
-Hi Ladies, I am a first time mom and my 1 month old has developed this body rash all over her entire body but majority of it is on her back. Any other moms experience this or have an idea as to what this could be? Pediatrician said to stop using lavender johnson and johnsons body wash but I haven't used that in almost a week and this has gotten more obvious.