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No, what is refered to here as ‘formula’ is not milk.
Chemo therapy is no excuse for anything. Its sole function is to drain the last bit of value from health insurance.
But the mother’s milk is not mandatory. Any milk from any mammal is superior to any ‘formula.’
Your argument seems to be that all formula is soy based. That is not true. People do forget that the choice is not just manufactured formula or breast milk. Human infants can be fed “formula” made from evaporated milk, karo syrup and water. For babies that cannot tolerate cow’s milk goat’s milk is often a suitable option.