In this task, you are given a sentence in the English language. Your job is to translate the English sentence into the Spanish language.

What is the recommended anatomical site for administration of a vaccine intramuscularly in infants less than 12 months of age?
¿Cuál es el lugar anatómico recomendado para la administración de una vacuna por vía intramuscular en lactantes de menos de 12 meses de edad?