By the fourth month, when the supine infant is pulled into a sitting position, no head lag should be present. Many other infantile reflexes have disappeared by 4 months, most notably the Moro reflex. By the eighth month, the infant should be able to sit without support.
Coordination of the hands begins at about 5 months, when infants can reach and grasp objects. By 7 months, they can transfer these objects from hand to hand. At 8 to 9 months, they should be able to use a pincer grip to pick up small objects.
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