My baby developed sudden hoarseness of voice then developed oral candidiasis then fever. After treatment, the candidiasis and fever were gone, but after about 3 weeks still has hoarseness. It should be known that he has attopic dermatitis and he was on hydrocortisone therapy, but we stopped that too for more than 3 weeks.
I would suggest a consultation with an ENT specialist who sees babies. It may just take a little longer for the hoarseness to improve but an otolaryngologist could examine the voice box in the office with a Fiberoptic telescope.
Hope this helps clear things up.
Scott D. Gold, MD