This document provides guidance on assessing and managing children under 5 years of age presenting with cough or difficult breathing. It outlines the IMNCI case management strategy which evaluates all problems, provides a classification, and offers treatment algorithms. General danger signs indicate severe disease and mean the child needs referral. Respiratory rate, chest indrawing, stridor, and wheeze are assessed. Potential causes like pneumonia, bronchiolitis, and asthma are considered. Investigations may include CBC, CRP, and chest X-ray. Severe pneumonia requires referral while mild cases can be treated with antibiotics, paracetamol, or salbutamol. Prevention emphasizes vaccination, breastfeeding, handwashing, and controlling pollution.