The best replacement for diaper is cloth.

The best alternatives to diaper are rated as following:
★★★★★  cloth
★★★★  disposable diaper
★★★★  disposable
★★★  nappy
★★★  catheter
★  no diaper
★  pull up
★  pamper
★  cloth diaper
★  disposal diaper
★  swaddler
★  film camera
★  disposable diapers
★  diapers
★  langot
  bedpan
  not to diaper
  all in one
  let baby sleep
  pocket diaper

Your alternative for diaper is not listed? Suggest!
Speaking about diaper, one probably shouldn't forget about catheter.

Other search terms related to diaper and their ratings are:
★★★★★ catheter
You have in mind a companion for diaper and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of diaper in all years. Click on graph for more.
diaper
cloth
disposable diaper