The gut is colonized with good bacteria and harmful - as well antigens - I would not think formula is the answer for this mother-bloody stools as an allergic reaction to a protein - cows milk being most common. Could see gut pain, bloating/gassy/cramps - belly looks like a frog - runny diarrhea - frank blood is a big concern. If the baby got better with mom milk - try hind milk pumping and feeding/nursing - Mom has to read labels - casein, lactose, whey - all are secret words for milk proteins
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