A nurse is providing discharge instructions to a client who delivered a newborn via cesarean birth 4 days ago. The nurse should instruct the client to contact the provider for which of the following findings?

A. It is normal for the newborn’s cord stump to remain attached for up to 1-2 weeks. B. Newborns typically sleep 16-20 hours per day, so this is expected. C. Fewer than four wet diapers in 24 hours can indicate inadequate hydration or feeding and requires immediate evaluation. D. Loose stools are common in breastfed newborns and are generally not concerning.