What is an early sign of dehydration in an infant?

An early sign of dehydration in an infant is a dry mouth or tongue. Infants have a high total body water percentage and are more susceptible to rapid fluid loss compared to older children and adults. One of the first physiological signs that indicate a deficiency in hydration is the dryness of the mucous membranes in the mouth and the tongue. This occurs because as fluid levels drop, the body prioritizes internal hydration over moisture in the mouth, leading to noticeable dryness.

Recognizing this sign is crucial for timely intervention, as it can assist in preventing more severe stages of dehydration. In infants, the absence of saliva and the appearance of a dry tongue can signify inadequate fluid intake or excessive fluid loss due to causes such as fever, vomiting, or diarrhea. Monitoring for this early symptom can enable caregivers and health providers to take necessary measures before the situation escalates to more severe signs.