The Bayley Scales of Infant Development show normative monthly motor accomplishments. According to this scale, infants develop the skill to "rotate trunk while sitting alone" at age 7 months but the skill "uses pads of fingertips to grasp pencil" at age 16 months. This is an example of:

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The normative monthly motor accomplishments listed on the Bayley Scales of Infant Development reflect a pattern of proximodistal development, which means that development progresses from the center of the body outward. Infants first gain control of their torso and then progress to the arms and legs. The example given of infants developing the ability to rotate their trunk while sitting alone at age 7 months and later developing the skill to use the pads of their fingertips to grasp a pencil at age 16 months reflects this pattern of development.

The Bayley Scales of Infant Development Show Normative Monthly Motor