Table 2.

Behaviors coded

Code	Description
Typical uses of object
Shakes/waves	Infant shakes, waves, or twiddles the object while holding it with one or both hands. Coded as duration
Bangs/taps	Infant uses one or both hands to hit, bang, or pound on an object, or uses an object to hit, bang, or pound another object, such as the table. Coded as duration
Mouths	Infant licks, sucks, or chews on an object. Instances where the child was sucking on the nipple of the bottle were not scored. Coded as duration
Throws/pushes	Infant throws the object, drops it off the table, or pushes it toward the examiner, ending their interaction with that object. Coded as frequency
Atypical uses of object
Spins	Infant drops, tosses, or manipulates an object in order to make it spin or wobble. Coded as frequency
Rolls	Infant pushes a round object along a surface so that it rolls. Coded as frequency
Rotates	Infant turns, flips, or rotates object at least twice. Coded as duration
Unusual visual	Infant engages in prolonged visual inspection (>10 seconds), examines object from odd angles or peripheral vision, or squints or blinks repeatedly while examining object. Coded as duration