For this part of the study, repeated (x5 times) measurements of the 4 vital signs in 50 young children (under 5 yrs) in hospital/clinics in Butembo DRC with suspected pneumonia, will be recorded using the Multimometer. These signs will also be measured at the same time, by conventional methods (regular thermometers for temperature, observed respiratory rate using recorded chest movements and end-tidal carbon dioxide (CO2) for respiratory rate, standard pulse oximeters for oxygen saturation and heart rate). All these measurements take less than 5 minutes. The investigators will repeat these sets approximately 5 times during the same day in the hospital or during a clinic visit. The vital signs will be compared between the two methods using Pearson's correlation coefficient and using Bland-Altman plots for agreement.