People that tell you you need to be ready are lying. The only thing you need to be able to sustain is feeding them, and the rest mostly works itself out. As it has for millennia.

The only reason this would not be the case is if you have specific requirements for the life of your child.

I would encourage you to look at the medical costs of children in the US. My children's braces alone will cost ~$7k-10k over the life of each of them, with insurance, and to do without will cause irreparable oral damage into adulthood. Certainly, this doesn't apply to other developed or developing countries, but to say "you just need to feed them" wildly differs from reality. You're just ignoring suffering at scale by saying "it'll work itself out." It doesn't, and I can provide pages of citations, grounded in data, to support this assertion. Also, having served a short stint as a Guardian ad Litem to advocate for children going through family court, I have anecdotal observations as to failure scenarios of failures to adequately provide for children, both materially and emotionally.