Vision is one of the most late maturing and slowest developing senses. To baby, the world is mostly a blur. At birth: Newborn babies see only light and shadow. Their optimal focal length is between 20 and 38 cm, which means that baby can just see mommy’s face when she is feeding. 3 months: Your baby can follow moving objects with their eyesight. 4-7 months: Your baby’s color vision development is complete. 6 months: Your baby’s sense of depth and jumping distance works reliably, which is very useful for a baby who is just starting to move quickly. 2 years: Most babies’ vision has reached about 0.3. 3-5 years: Vision will gradually increase to 0.6 to 0.8, and the clarity of vision will continue to improve. 9 years: Your baby’s vision will be similar to that of a normal adult. normal adults. The baby’s vision will increase to 6~0.8 after the age of 9. The behavioral characteristics such as slow movement, lack of vigorous activity, and small range of motion despite normal intellectual development also indicate some problems in visual development.