Two quick thoughts - sometimes green stools (hopefully very rarely) are "starvation stools" and an indication that the baby is starving.  A quick google told me that has to do with liver bile.  Of course we see green stools for other reasons as well.

Has the baby been evaluated for a heart condition?  A heart that is not working effectively can use up calories so there aren't enough left over for growing.

Ellen

Ellen J. Rubin, MA, IBCLC, LLLL

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