My old friend, anxiety
I just convinced myself by staring at baby Margot for an hour that her breathing was terrible and that she had RSV.
I went downstairs to show my husband and even shed a few tears. He calmly opened her outfit, her breathing looked normal. He counted her breathes per minute, normal. She sounds normal.
You would think having a second infant would slow down my need to stare at them while they sleep at night, but you would be wrong.