If your baby is diagnosed with acute pharyngitis and has a fever, after three days of intravenous fluid treatment, the fever subsides and rashes appear. If diagnosed with infant rash, no further intravenous treatment is needed. Infant rash is a viral rash that will disappear on its own in two days. It’s not contagious, but it’s important to keep your baby at home temporarily as their immunity is low. Encourage plenty of fluids, moderate feeding, and increased vegetable intake to maintain regular bowel movements.