As early as 25 weeks in utero when the eyelid becomes  unsealed and the eyelids open and close, the fetus starts to blink.

At around 33 weeks of gestation, the fetus becomes sensitive to bright light the can penetrate the skin of the pregnant belly.

Newborn:
At birth, the baby can see well and can focus at about 25-30 cms or 8-12 inches - the distance between him and you when you hold him in your arms and so he sees your face clearly while nursing. At a further distance, the image is blurred.

0-3 months:
Below the age of 3 months, he cannot differentiate all colors; he can only see the brightest   colors - red and blue initially and then green and yellow. So make sure you have brightly colored  objects around him. The maturation of the brain is very essential for this.
The baby prefers to look at a human face and concentrates on the eyes. He can also see moving objects. Remember that during the early newborn period, the blinking reflex is absent.
Brightness and movement are the 2 things visible to him.
The baby's visual powers will not be fully developed until he is between 3 and 6 months.

3-6 months:
Now a 3-dimensional vision taking into account depth starts developing. It is necessary for the baby to understand depth before he moves and he will not move unless he understands depth.

At around 12 months:
The child can see well and follow rapidly moving objects and he has developed his full potential for sight.