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Some researchers believe newborns can recognize their mothers almost immediately after birth but this is based primarily on voice recognition. True visual recognition probably takes a few weeks. "There is some evidence that babies can recognize voices and faces within weeks of birth," says Howard Reinstein, a pediatrician in Encino, California and a spokesperson for the American Academy of Pediatrics. Certainly by 6 months your baby will know exactly who you are even when you're not around. One study of 6-month-olds found they could recognize a picture of their mother when shown a variety of faces.

At first a baby's vision is quite blurry, and he can only see things about a foot away — the distance between his eyes and yours when you're feeding him. "By about 3 months you'll notice that your baby is able look directly at you and can even track an object that you move from side to side in front of him," says Reinstein. Around 4 months he'll start reaching for objects. Between 1 and 2 years, a child's vision sharpens with each passing month so that by his second birthday his vision will be nearly perfect, around 20/60; At age 8 a child with normal vision will see 20/20.

http://www.babycenter.com/408_when-will-my-baby-recognize-me_1368483.bc