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This is the second in a series of three articles on normal infant and child development. The previous article covered the acquisition of motor milestones. This article focuses on cognitive development. Social-emotional development will be discussed in the final article.

Infant and child development relies on significant interdependence of the developmental streams. The infant who is concentrating on gross motor control while sitting is unlikely to be able to explore an object's detail or advance his or her manipulation of objects. The clinician must appreciate the total developmental progression of a child while also understanding the patterns of development expected within individual developmental streams. Such improved understanding of development can assist in the pediatrician's surveillance of a child's progress but will not substitute for a systematic developmental screening program, as outlined in recent American Academy of Pediatrics (AAP) Practice Guidelines. The...

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