Good day, could you please tell me, I gave birth to a boy at 41 weeks …

Good day, could you please tell me, I gave birth to a boy at 41 weeks and 6 days, and we have blisters with yellow fluid on our bodies when we pop them, there are many on his head now. What could it be? Did you experience something like this? They told us that because he was pre-term and the rash will go away, but already a week has passed and the rash hasn't gone away...