Prep School { how to prep cloth diapers }

First, these diapers are going up right against your baby's super sensitive skin. You'll want to remove any manufacturer's funk before putting the diaper on your babe.

Secondly, natural fiber diapers may arrive to you large and stiff (think prefolds and flats here). You'll want to prep them to shrink them down to their predestined size and soften them up.

And, most importantly, you'll want to get them to their state of maximum absorbency. Natural fibers like cotton, hemp, and even bamboo have natural oils on them which need to be removed in order for them to be fully absorbent.

Prep cloth diapers

Now, onto the harder ones.

Diapers with waterproof outers but natural fiber inners:  These are typically pockets, AIO, or AI2s  that have a PUL or TPU waterproof outer but the linings and/or soakers are made of cotton, hemp, or bamboo. Some examples of these would be bumGenius Elementals, Grovia AIOs, Swaddlebees, etc.

With these diapers you'll need to treat them a little differently. You need to wash them on hot with detergent and tumble dry between 3-7 times before use. Also, you need to wash them separately from your other diapers the first few times because you don't want the natural oils to coat your other diapers and cause repelling issues. Natural fibers will continue to gain absorbency as you wash them.
As a sidenote, I'm too impatient to wash anything 6 times before I use it so I usually wash it a couple of times and then start using it knowing I may need to change my little one a little sooner.

Last but not least...

Prefolds, Flats, and some fitteds: Pretty self explanatory. Also in this category would be cotton, hemp or bamboo inserts or doublers.

These diapers will need to be washed with detergent and dried between 5-10 times before they reach maximum absorbency. Essentially you are "stripping" them of their natural oils. This will use up a lot of time, energy (yours and your home's), and water.

An easier way to strip them of their oils is to boil them (but do NOT boil anything with snaps, elastic or PUL/TPU). To do this:
1.) Fill a large stock pot with water and a small squirt (seriously, a little goes a long way - use less than a teaspoon) of blue Dawn and bring it to a boil.
2.) Add your prefolds or flats (or hemp inserts, etc) a few at a time - depending on the size of your pot you may be able to add more - and boil them for 30 minutes.
3.) Transfer the boiled prefolds into a large bowl/pot/bucket using tongs. You'll notice the water has a dingy tint to it - that would be the natural oils that you've just stripped from your diapers.
4.) Drain the dingy water then repeat until all of your diapers have been boiled.
5.) Once they're all done transfer the boiled diapers into the washing machine (probably not more than 18-24 diapers at a time depending on their size. Wash them on HOT. Do not add detergent. If you have any suds you'll need to repeat the rinse cycle until they're gone.
6.) Dry them on medium or hot in the dryer.

A note on boiling: a lot of companies and stores do not recommend this method because it's kind of dangerous to be handling scalding hot diapers and large pots of boiling water. Be careful if you choose this method. There are a lot of helpful tutorials and videos about this online.
Also: DO NOT boil anything with SNAPS, ELASTIC, or PUL/TPU.

Once prepped the prefolds will have shrunken a bit (up to about 25% or so), will have "quilted up" and will be nice and soft.