An infant or baby is the very young offspring of humans. A newborn is an infant who is within hours, days, or up to a few weeks from birth.
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A child is generally a human between the stages of birth and puberty. A boy is a young male human.
Optimism is having hopefulness and confidence about the future or successful outcome of something; a tendency to take a favorable or hopeful view. Research has shown that optimism can correlate with good health at many stages.
A smile is a facial expression formed by flexing the muscles near both ends of the mouth. The smile can also be found around the eyes.
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