This is the most critical data point. A quality diaper should have less than 0.5 grams of moisture on the surface after 10 minutes of pressure. The catalog should provide third-party lab results or internal testing metrics.
Buying larger diapers too early causes leaks. A good catalog includes a "weight vs. waist size" calculator. Do not rely on the box; rely on the catalog’s centimeter/inch breakdown. Quality Diapers Net Catalog
Disclaimer: Always consult your pediatrician for persistent diaper rash or skin sensitivity. Specifications and prices in net catalogs are subject to change. Always verify certification claims with the manufacturer. This is the most critical data point