Only pure wool, or close to it, will do for making wool diaper covers. You will be felting them in the washing machine, and only real wool will felt, so don’t waste time or money on anything less than 85 percent wool.
Felting in the washing machine is very easy – combine hot water, a tiny bit of soap, and full agitation to break down the fibers in wool and create a solid, water resistant mat. You may need to run them through the agitation cycle more than once, but once they are felted, they will not unravel or unfelt.
Felted sweaters can be cut into any shape, so cut them into the right size for a diaper, sew them together and use them over and over again, in place of disposables. You will need a liner, because contrary to their names, wool soakers do not actually soak up anything – they provide a barrier to prevent leaks.
For the liner, you can cut up old flannel sheets and make them into diaper sizes. Pin them together, cover with a soaker, and you’ve got one of the least expensive diapers out there.