My daughter is 3.4 years old. She has falling sick frequently these days, like once in 2-3 months for last 6 months now. In August she had respiratory infections and was hospitalized for venal antibiotics for 5 days. Now again she has cough with high fever. Doctor has prescribed erithromizen and paracetamol. 3 days now, fiver subsides when paracetamol given and returns after 5-6 hours. Please advise what are best ways improve my child's immunity.