I used a diaper service with dd#1 for about 3-4 months. Then I started washing my own diapers. I just checked their website, the cost per week depends on how many diapers you need a week. $15 for 55 dipes and $17.50 for 80 dipes. They have regular prefolds. I bought diapers through the diaper service, but thats extra. And you wash the covers yourself. I started with 60-65 diapers, dd#1 was about 3-4 months old. With newborns you probably need more (with dd#2, I have about 25 diapers and I was every other day in the beginning, now its about every 2-3 days). So it all depends on your child.