The nurse compared the birth weight of a 3-day-old with her current weight and determined the infant had lost weight. What is the most appropriate intervention by the nurse?

Weight loss in a newborn during the first few days of life is a normal and expected physiological occurrence, so the most appropriate nursing intervention is to do nothing, as it does not require escalation or intervention beyond routine monitoring and feeding support. Neonates typically lose up to 7 to 10 percent of their birth weight in the first three to five days after delivery. This loss occurs primarily because of the excretion of meconium, loss of extracellular fluid, and the relatively small volumes of colostrum ingested before mature breast milk comes in. Most newborns regain their birth weight by 10 to 14 days of age. Trying a different formula is unwarranted because weight loss at this stage is physiological, not a sign of formula intolerance. Reporting the discrepancy to the pediatrician immediately implies an abnormal finding, which this is not unless the weight loss exceeds 10 percent or the infant shows signs of dehydration, poor feeding, or illness — none of which are described in this scenario. Decreasing the interval between feedings is not indicated as a first-line response to expected physiological weight loss at three days; increased feeding frequency may be warranted if weight loss is excessive or breastfeeding is not well established, but the stem does not suggest an abnormal degree of loss. Recognizing normal newborn physiological changes is essential to avoid unnecessary interventions and parental anxiety.