The main purpose of this study was to observe the effect of amino acid formula on infants with cow's milk protein allergy; to evaluate the role of food avoidance and Open Food Challenge test in the diagnosis of infants with cow's milk protein allergy; to observe the allergic process in infants with cow's milk protein allergy and to explore the criteria for diagnosis and treatment.
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Negative rate of open food challenge test
Timeframe: From baseline to AAF feeding for 6 months