Am I ready to be a mommy?

I've been thinking about this a lot recently. I feel like emotionally & physically I'm ready to be a mother I just want to make sure all my bases are covered. Financially I'm curious from a mothers perspective how much do you think a child costs monthly. I'm aware of the larger expenses at hand & I fully intend on using cloth diapers after the first year. I'm just looking for a ball park figure or estimate on what monthly I should be prepared for. I don't want to bring a child into the world unless I know without a doubt I can fully support it in all aspects of my life.