As long as you provide the necessary nutrients
via formula, vitamins, etc., you shouldn't
need breastmilk for the child.
(First time was thrush following a c - section and antibiotics and my ignorance at the time about the
need to take a good probiotic supplement; second time was less clear, but I suspect it started with a «normal» rash that got out of hand and / or a candida overgrowth of my own that I again passed
via breastmilk.)