Partially Hydrolyzed Whey Protein Formula for Infants With Mild Allergy

Inclusion Criteria: 1. Infants aged ≥12 weeks and \<20 weeks at the time of screening. 2. Gestational age ≥37 weeks. 3. Birth weight ≥2500g. 4. Presence of mild allergic symptoms (e.g., skin, gastrointestinal, or respiratory symptoms). 5. Infants who are predominantly formula-fed or mixed-fed at the time of enrollment. 6. Legal guardian has provided written informed consent and agrees to participate in the study. Exclusion Criteria: 1. Diagnosed with moderate or severe food allergies, including a history of allergic conditions such as atopic dermatitis, wheezing bronchitis, or severe allergic reactions. 2. Confirmed cow's milk protein allergy. 3. Currently receiving a partially hydrolyzed formula or any other specialized formula. 4. Exclusively breastfed infants. 5. Known allergy or intolerance to the study formula. 6. Presence of severe illness (e.g., digestive, respiratory, neurological infections, other gastrointestinal diseases, gastrointestinal anatomical abnormalities, congenital malformations, or growth retardation). 7. Infants with a history of severe diseases such as heart, brain, liver, kidney, hematologic, connective tissue, endocrine diseases, or mental disorders. 8. Infants who have undergone major surgery that may impact the study outcomes. 9. Infants who have used systemic immune-modulating medications (e.g., anti-allergy drugs, corticosteroids, immunosuppressants, biological agents) within the last 2 weeks. 10. Infants who have used gastrointestinal medications (e.g., proton pump inhibitors, gastrointestinal motility agents, or digestive remedies) within the last 7 days. 11. Infants who have used probiotics within the last 7 days. 12. Parents who are unable to report the occurrence of symptoms or adhere to the study visits and protocol requirements.