Toddlers make visible progress in their comprehension skills early in their second year, demonstrating their growing understanding of language with rapid responses to directions and questions. At this age, they are capable of pointing to an object or picture when its name is spoken.
Shelov, S. P. (Editor-in-Chief). (2004). Caring for Your Baby and Young Child: Birth to Age 5. The American Association of Pediatrics. Revised edition. New York: Bantam Books.