Babies are born with limited vision, but soon after birth, they can focus on objects about 8 to 15 inches away. By 1 month, most babies can focus on objects up to 3 feet away.
Atkinson, J. (1984). Human visual development over the first 6 months of life: A review and a hypothesis. Human Neurobiology, 3, 61
Shelov, S. P. (Editor-in-Chief). (2004). Caring For Your Baby and Young Child: Birth to Age 5. The American Academy of Pediatrics. New York: Bantam Books.