Agree with the previous comments. There is risk here to both the mother and the infant. It is essential to get control of the CML ASAP. I know breast feeding is felt to be important at many levels, but even if the risk to the baby was non-existent, the possibility of disease progression to something not controllable, does exist. I believe in talking bluntly. If Mom wants the best chance to see the infant grow up, then she must get her CML under control. The infant will survive formula. Mom needs ideal therapy.