Ay mama, ang pattern na yan parang hindi pa sure HFMD based sa description mo, kasi HFMD usually starts sa bibig talaga (lots of painful sores, hindi lang one), then the rash comes sa palad at talampakan, hindi sa cheeks at chest area pa lang like your baby. Pero honestly, mas safe na mag-check pa rin with your pedia kasi ang fever na on-and-off combined with UTI at the rash pattern ay kailangan ng proper look, a few of us din nag-worry dito, pero hinding-hindi worth the stress na mag-guess na lang, especially since she's already on antibiotics and your doctor needs to know about all these symptoms together. Hopefully it's something lighter na, pero best talaga na i-confirm with your pedia kung yung rash ay HFMD or something else entirely! Let me know how it goes, praying for your baby na mabilis mawala lahat!