what kind of stains do you want to remove? food? poo? formula? breastmilk?
can try putting wet items in full sunlight for half a day--you'd be surprised at the bleaching power of the sun to get out stains! for more stubborn stains, squeeze lemon juice on first, then sun. gets almost anything out.
something stronger, but not as strong as bleach is hydrogen peroxide--just dab on the stain before washing. don't let it sit more than a few hours though before washing.
hth!