You can give the unused diapers to other babies who need them. You can also take out the polymer absorbent material inside the diapers and mix it with an equal amount of soil for potted plants to get a light, fluffy and water-filled soil.
If you are afraid of waste, send it to someone who needs it. If you are not afraid of waste, you can disassemble it for other purposes, such as water absorption, or directly classify and throw it away. It is suggested that if it is still in the shelf life, it can be sent to those who need it.