5 – 8 MONTHS
Their world is more detailed
As the control of eye movements improve, your baby now starts to develop a three-dimensional view of the world.
At 5 months of age, babies have developed the ability to see in colour .
Infants between 5 and 7 months of age can distinguish between the facial expressions of happiness, anger, fear, and surprise.
At about 8 months old, most babies start crawling. Crawling helps to further develop coordination between the eyes, hands, feet, and rest of the body .
 Infant Vision: Birth to 24 months, American Optometric Association (2021), https://www.aoa.org/healthy-eyes/eye-health-for-life/infant-vision?sso=y
 Bornstein, M. H., & Arterberry, M. E. (2003). Recognition, categorization, and apperception of the facial expression of smiling by 5-month-old infants. Developmental Science, 6, 585–599.