A nurse plans a physical examination of an infant who is sleeping. What action should the nurse plan to perform first?

Choice A reason: Checking for a diaper rash requires undressing the infant and manipulating their limbs, which is highly likely to wake them. In pediatric assessment, intrusive or potentially uncomfortable procedures should always be delayed until the end of the examination to maintain the infant's cooperation and physiological baseline. Choice B reason: Measuring length involves stretching the infant out on a measuring board, which is a stimulating and often upsetting procedure for a baby. Performing this first would cause the infant to cry, making it impossible to accurately assess heart and lung sounds due to the resulting respiratory and vocal noise. Choice C reason: The nurse should always perform the least invasive and quietest assessments first while an infant is sleeping. Auscultating the heart, lungs, and abdomen while the child is still allows the nurse to hear clear sounds without the interference of crying, movement, or increased heart and respiratory rates. Choice D reason: Assessing muscle tone involves manipulating the infant's extremities to check for resistance and recoil. This physical contact is stimulating and will likely disturb the infant's sleep. Like measuring and diaper checks, this should be deferred until the nurse has completed the "quiet" portions of the physical assessment.