If this doctor, who lived one block away from there, would have come 20 minutes earlier, not have to wait until that siren he heard before coming from the ambulance, if he would have heard about it way before, he would have saved this child.
Se aquele médico, que morava  a um quarteirão dali, tivesse chegado 20 minutos antes, não tivesse tido que esperar pela sirene da ambulância, se ele tivesse sabido daquilo bem antes, ele teria salvado aquela criança.