How much money do you REALLY need to have a baby?

How much money would you suggest someone have before they start trying for a baby? What should you have saved up? How much would you suggest they make a year? For reference, we live in the Midwest in a pretty inexpensive city. I'd say average rent is probably about 800-1000 a month for a decent sized place with at least 2 or 3 bedrooms. I know it depends on different factors like whether you use formula, cloth diapers, child care, and all that. So just from your own experience what would you ball park it as?