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Lasts from conception to birth.
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Lasts through the second week. They are usually starting to focus more on their parent's face.
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Lasts two weeks through the first birthday. They are bonding with people.
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12-36 months. Starting to walk although it is still unsteadily.
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3-6 years. Starting to go to school and learn
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6-12 years. Finding friends and enjoy talking to others.