Welcome to HCM forum.
Yes continuous high grade fever ( > 102 F ) can be dangerous in children .
However many a times a viral or bacterial respiratory do present with accompanying fever for a couple of days .If the fever decreases with crocin
you can give it round the clock every 6 hourly to maintain the temperature .
Tepid sponging of the child's body with water at room temperature can help prevent the complications of high fever like dehydration
Meanwhile make sure to give plenty of fluids , for faster recovery.
If fever persists despite these beyond 48 hours or if it worsens and child has breathlessness or irritability or refusal to feed then do consult your pediatrician
Wishing your child a speedy recovery.