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Hearing is fully developed. -
Child will begin smiling at people, making sounds and turning towards sound, and paying attention to faces and tracking things with eyes. They should be able to hold their head up to some extent. -
At this stage, the child will start to copy facial expressions and movements, copy sounds, and recognize familiar people and things. At this point, color vision should be fully developed.
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By 6 months, the baby should be responding to others' emotions, and responding to outside stimuli with noises or other body language. They will show curiosity by attempting to grab things that are out of their reach, and they may be ready to start eating solid foods (though this varies).
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They should know their name by this time.
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By this time, the child should have spoken their first word, though this can happen as early as 4 or 5 months.
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They should start walking with supports by now. -
By this time, the child should understand "no" and maybe some basic commands. They will point at things that they notice. -
By 12 months, they should understand simple sentences and directions.
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The baby should be walking without any help. -
They should be speaking full 2-4 word sentences. They will also begin to show defiant behavior, and will exhibit more independence.