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When the infant turns where it's been touched.
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A newborn reacts to the sensation of falling.
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Place the newborn on it's stomach with it's head turned to the right. The limbs on the right side will straighten and the limbs on the left will curl. This goes for whatever side the head is turned to.
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A baby will scan it's surroundings until it reaches the edge of something and it's eyes will follow along the edge.
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At 2 months of age, babies can distinguish phonemes.
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Babies can begin to lift their head on their own at this point.
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At 4 months old, babies can begin to smile because they're feeling happy, rather than just smiling because, well because.
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At 4 months, babies can start sitting with some sort of support to hold them up.
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At 5-6 months old, babies begin to gain the physical capacity to grasp an object when it's in their hands.
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At 6 months, babies start making cooing, almost african-like noises.
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At 8-10 months, babies can begin to crawl around as their legs grow stronger to move them around.
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At 9 months old, babies can walk around holding onto furniture.
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Self explanatory - at a year old, babies can say their first word.