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move both arms well and coordinate movements
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make sounds like gurgling, cooing, babbling, etc.
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respond to parents' voices
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hold up head for short periods of time
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follow objects with their eyes
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recognize parents' faces
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turn to locate a sound
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roll over from stomach to back, or vise versa
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push up with arms while lying on stomach
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put some weight on legs when held in standing position
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play with own hands and feet
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imitate sounds