Has the mum given the baby any baby panadol, or nurofen for babies? That will help reduce the fever, however 5-days with a fever is extremely dangerous! If you can't reduce the childs fever take her to the doctor asap. I'm not a mum but my sister in law is a nurse and has 2-kids of her own. When they've had fevers in the past that she couldn't bring down she immediately took them to the hospital.
Children can get very sick and it happen very quickly. Don't put her life at risk, get her to a doctor asap if your friend can't reduce the fever.
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There seems to be some missing piece in the story. A child cannot have high fever and be happy and chirpy. What usually happens with children is that they play and seem happy during the time the fever is down. Since it has been 5 days, the infant should be immediately taken to a pediatrician for careful assessment. It could be viral fever, or else it could be SLE, rheumatoid arthritis, Polyarteritis nodosa (PAN) and other auto immune disorders, UTI, drug fever, sinusitis, glandular fever, otitis media, IBS, endocarditis, parasitic infestations, fungal infections, lymphomas and other cancers etc.
It is difficult to comment beyond this without examining. A comprehensive investigation is required keeping all the points in mind. Hope this helps. Please let me know if there is any thing else and do keep me posted. Take care!
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