I'm really worried about my 2.5-year-old son. He's been dealing with a cold and cough for a few days, and the pediatrician said it might be WALRI. We started him on clarithromycin and nebulizer treatments, and we're on day three now. When I check his SPO2 while he's asleep, I'm seeing it fluctuate between 89 and 92, and sometimes it jumps to 95 or 96. Is this normal? Should I be concerned about these fluctuations? What should I do next?