Undernutrition in children less than five years of age is common throughout sub-Saharan Africa. Nutritional deficiencies may lead to less ability to fight infectious diseases. The purpose of this study is to determine whether zinc supplements plus standard antibiotics reduce the length of hospitalization in children with pneumonia. Six hundred children aged 6-36 months diagnosed with pneumonia and admitted to Muhimbili National Hospital (MNH), Dar es Salaam, Tanzania, will participate in this study. Half of the children will receive daily supplements of zinc, and the other half will receive placebo tablets (dummy pills containing no medication). Each child will be followed for 6 weeks after hospital discharge to check for recovery from the illness. All children in both groups will receive antibiotics and supportive care to manage pneumonia, according to the standards of care at MNH and Amana Municipal Hospital in accordance with the Recommendations of the Ministry of Health, Tanzania.