I noticed while bathing dd an hour ago she had a rash over her body. It was mainly on her chest and tummy and nowhere else. It looks similar to heat rash, tiny little red bumps. I have put her to bed now, she has been happy, laughing and showing no signs of distress. No new foods have been introduced and nothing out of the ordinary.
Should I be worried about this rash? Because I am worrying Just because it's at night too. I will get her out for a dreamfeed at 10pm so can check it again. What could it be?

ETA: No fever either. Temp was at 36.5