It is very common for toddlers to have frequent colds as their immune systems develop. While honey is safe and effective for soothing coughs in children over one year, clinical evidence regarding the safety, purity, and efficacy of herbal formulations in young children is limited. There are no scientifically proven pharmaceutical 'immunity boosters.' The most effective way to support his immunity is through a balanced diet, good hydration, and adequate sleep. For symptom relief, saline nasal drops are safe and effective. Please consult your pediatrician before starting any supplements to ensure the correct dosage and to rule out underlying issues like allergies.