1. Check category depth
A supplier that understands pocket diapers, AIO styles, covers and inserts can usually discuss the system rather than only one SKU.
2. Review material and construction options
Ask which fabrics, waterproofing methods, inserts and snap configurations are available, and which parts are standard versus custom.
3. Evaluate sample communication
Good sample development should produce clear confirmation of dimensions, print, materials and packaging before bulk production.
4. Verify quality claims
Ask for the evidence behind certifications, factory figures and test claims instead of relying on website logos alone.