Based on this, passing blood and mucus signifies localized inflammation, injury, or severe irritation within the lower intestinal lining. Given his background of formula changes, this flare-up could point to an allergic cross-reaction like Soy Protein-Induced Enterocolitis/Proctitis, a newly triggered allergic reaction to the proteins in newly introduced solid foods (such as wheat/gluten), or an acute infectious gastroenteritis. However, for a proper diagnosis and to evaluate his hydration safely, a physical examination by a pediatrician is required.
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