By 18 months most typically developing toddlers have acquired a basic set of abilities that provide the substrate for more complex, goal directed and sequential hand tasks that are acquired in the toddler years (about 18-36 months).
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Video clips and analysis
From about 12 months young children develop a fasciation with posting objects through apertures. In this series you see toddlers at different ages posting objects into different containers with different sized and oriented apertures.
In this video you see Will (17 mo) building towers using yogurt tubs.
Threading beads involves a sequence of actions that take time to learn.
Ball games provide children repeated opportunities to practice the two important aspects of catching, throwing and kicking: these are visual information gathering and then using this information to plan the movements needed for a particular task.
This video beautifully illustrates a typical paly session with a toddler: while I try to elicit catching and throwing actions, Max has his won agenda.