My 1wk till 8mths had a fever of highest 104.7 which last 3d. nows gone but a day later there's these red dots all over her body could it be rubella?

Doubtful: We haven't seen much rubella and red dots, specifically tiny red dots are more consistent with an enterovirus infection.If you have known exposure to a case or have specific concerns, see your pcp to be sure.

Roseola: Very common virus seen in this age group -6 months to 24 months. Fever can be as high as 106! caused by virus called human herpesvirus 6 (hhv-6). Transferred by oral secretions, not very contagious, no seasonal variation . Fever may last from 1-6 days, typically 3 days . Within 12-24 hrs of fever breaking a rash rapidly appears like "measles". It can be raised or flat, .Supportive treatment.