She was the daughter of Tenor and Jorge Infantas, and grew up in the El Almendral neighborhood of Valparaíso.

[1] In 1962, she participated in the third annual Viña del Mar International Song Festival; her performance of "El loro aguafiestas" (with backing from Los Cóndores) won the first place in the competition.

She made international tours of Argentina, Uruguay, Peru, Ecuador, Colombia, Venezuela, West Germany and Panama.

She received the award from President Michelle Bachelet at age 92 in an official ceremony at the La Moneda Palace.

[5] In March 2019, in the context of the commemoration of Women's History Month, a biography titled "Silvia Infantas, voz y melodía de Chile" was published; it was written by music journalist David Ponce.