Which method is commonly used to evaluate urine output in non-potty trained infants and toddlers?

To evaluate urine output in non-potty trained infants and toddlers, weighing the diaper before and after micturition is the most accurate method. This technique allows healthcare providers to directly measure the amount of urine eliminated by the child. The weight increase in the diaper correlates to the volume of urine produced, as the weight of the wet diaper can be compared to the dry diaper. Generally, a gram of weight corresponds to a milliliter of urine, providing a straightforward calculation of urine output that is critical for assessing hydration status and kidney function in young children.

In contrast, monitoring the amount of time for breastfeeding does not provide any direct information about urine output, as infants may not always void immediately after feeding. Measuring the formula before ingestion is relevant for fluid intake, but does not reflect urine output. Weighing the child before and after feeds can indicate weight gain but does not separate out urine output from other factors like fluid absorption or tissue changes. Thus, weighing the diaper offers the best clarity and reliability for assessing urine output in this age group.