We use reusable nappies for our toddler, and the washing machine is powered by solar so I only really need to feel bad about any excessive water use. But then we still have to use disposables when they’re at their nursery for a few days a week, or the staff don’t smell anything and they get bad rashes we spend all week dealing with. At the very least though the nursery deals with nappies as a specific form of waste that they process separately, though I’m not sure to what end.