Infant food protein allergy is the most common allergic disease in children, which can lead to infantile-specific dermatitis, intestinal inflammation, and so on. Dietary avoidance is a common strategy for food protein allergy in infants and young children. However, the hidden etiology of food protein allergy or multiple food allergies often leads to poor efficacy. The aim of this study is to observe the clinical effectiveness of Bifidobacterium intervention on food allergy.

Inclusion Criteria:

• 0 -12 months infant
• Infants that are allergic (confirmed by an allergist) to at least one of the main food allergens (cow's milk, egg, soy or wheat) and is following an elimination diet to at least one of these allergens.

Exclusion Criteria:

• Patients had used probiotics within 1 month prior to the study
• Allergy or intolerance to probiotics or their excipient
• Serious primary diseases of the cardiovascular, nervous, respiratory,hepatobiliary immunology，and endocrine systems;