Anybody know what this rash could be?

Whitney

My baby is 6 days old & about 3 days ago this rash showed up. I took him to the doctor, & he said to keep a close eye on it but didn't really have an absolute answer to what it might be! You guys have any idea? It doesn't seem to bother him at all. We've been putting neosporin on him twice a day (as directed by his doctor).