Baby's eye muscles are stronger and the “cross-eyed” effect is disappearing. Babies this age can track objects in motion. Beginning around 4 months, baby's vision will coordinate both eyes together, which leads to the beginning of depth perception. Babies will be able to distinguish distances and differentiate between shades. Babies up to 6 months have a clear preference for bright contrasting colors. At about 4 months of age they can see all the primary colors, with blue being the last color that is perceivable.Hearing:
Music is calming to babies of this age. They enjoy listening to a variety of sounds and voices, including environmental sounds. At 4-6 months, babies begin to hear not only tones but can begin to pick out single words. A 6-month-old begins to distinguish different language patterns, recognizing that the language spoken in the home is different from a foreign language.Touch:
Beginning around 4-6 months, babies explore using not only their hands but also their mouths. Babies put everything in their mouths because this is an effective way for them to explore their environment and learn about it.