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Well she recently was tested due to some blood we found in her stool and she has a
formula protein allergy. This means any regular or soy formulas. It was very hard to see and if any new parents question blood in their infants stool this test is easy and fast, like testing cocaine. Ask your doctor.
Only 8% to 15% of infants with this type of allergy have an adverse reaction to soy formulas.
You can read more about the allergy below and note the only symptom Abigail had was the fine trace of blood in her stool.
http://kidshealth.org/parent/medical/allergies/milk_allergy_p2.html