We invested in cloth and use them exclusively. We've tried a few different brands and styles, but by far my favorite are Charlie Banana. They're easy to wash, especially when a baby is still exclusively breastfed and their poop isn't smelly yet (One of the fun practical perks to breastfeeding)!
The initial investment seems costly, but it doesn't take long for them to pay for themselves (and then save you BIG TIME) because you keep re-using them.
One neat thing about Charlie Bananas is that they have the option to buy one-size diapers that are adjustable from 6-35 pounds.
Or you can buy all girl
or all boy.
Or you can try just one diaper just to see how you like it:
Even counting the cost of water, electricity, and laundry detergent, we've saved tons.