Biolizin for Improving Functional Poor Appetite in Children Aged 6 to 36 Months (CTBE2502)

Inclusion Criteria: * Age 6 to 36 months at screening. * Functional poor appetite for ≥2 weeks with at least one of the following: * Clearly reduced intake versus usual (lower amount of food and/or fewer meals per day); * Prolonged meal duration (\>30 minutes per meal); * Refusal or avoidance of familiar foods previously accepted; * Oppositional feeding behaviors (turning away, crying, gagging/retching, prolonged food holding, lack of cooperation during meals). * No obvious organic cause of poor appetite (e.g., acute infection, gastrointestinal/metabolic disease). * Weight not below -2 SD compared with WHO growth standards. * Parent/guardian provides written informed consent. Exclusion Criteria: * Ongoing acute or chronic illnesses that can affect intake or absorption, including but not limited to: * Acute infections (e.g., tonsillitis, pneumonia, otitis media, viral febrile illness, acute diarrhea); * Chronic conditions affecting digestion or metabolism (e.g., celiac disease, malabsorption syndromes, chronic liver disease, chronic kidney disease, diabetes). * Neurodevelopmental or neurological conditions that impair feeding (e.g., cerebral palsy, autism spectrum disorder, global developmental delay). * Current or recent use of medications known to alter appetite or digestion/absorption (e.g., systemic corticosteroids, antiepileptics, prolonged antibiotics). * Use of zinc-containing products or other appetite stimulants within 7 days before screening. * Known hypersensitivity to any component of the study product. * Malabsorption, severe malnutrition, or requirement for specialized nutrition, including: * Confirmed or suspected malabsorption (e.g., celiac disease, severe lactose intolerance, short bowel syndrome, inflammatory bowel disease); * Severe malnutrition per WHO criteria (e.g., weight-for-length Z-score \< -3 SD, nutritional edema, marked loss of subcutaneous fat/muscle); * Physician-prescribed specialized nutrition plans (therapeutic formulas for cow's milk protein allergy, severe malnutrition, tube feeding, or individualized nutrition regimens beyond usual diet). * Nonadherent caregiver or high risk of loss to follow-up as judged by the investigator.