My almost 3year old daughter has recurring high fever (104.5) every few weeks or so with no other symtopms., last for 4-7 days. dr has no answer?

Genetic?: A host of genetic semi-diseases, from cyclic neutropenia to familial mediterranean fever, can do this. I would consider asking for specialist referral. Your child is fortunate to have a parent who is so devoted as to seek advice from strangers. Good luck.

Peds rheumatologist: The most likely cause of recurring fever in children is infection. Kids in daycare for the first time will often get repeated viral infections. If she has already seen a pediatric infectious disease specialist and no likely infection found, your next stop should be a pediatric rheumatologist. We specialize in autoimmune and autoinflammatory disease diagnosis and treatment: pfapa, fmf, traps, etc.