Nursing is a far cheaper, easier, and more nutritious option.
I nursed all three of mine and they did well.
Yes, I know, some women can’t nurse for various reasons but they are the exception, and not the rule.
Even nursing for a few months confers great benefit to both mother and child. If you can’t continue, switching to formula is an option. At least it gets the baby past a critical phase where it is more susceptible to infections.