Girls, could you please tell me something? My daughter is 1.5 months o…

Girls, could you please tell me something? My daughter is 1.5 months old. Today morning and yesterday afternoon she had a temperature of 38.5. She called the doctor who checked, her throat was clean, nose was clean, there was no thrush, no stomatitis, what could it be? I know that about teeth is premature to say, but I suspect them, why do I think so? The lower two are swollen, and she's always putting her hands in her mouth even when full. We give her a pacifier, but she throws it with her hands, which makes it constantly fall out. My son at 3 months already had 2 lower ones. We sleep poorly.