At what age can children usually build a tower of two blocks?

Children typically develop the ability to stack two blocks around the age of 12 months. At this stage, children are refining their fine motor skills, improving hand-eye coordination, and beginning to explore their environment through manipulation of objects. By 12 months, most infants can grasp objects more effectively and have the dexterity needed to align and stack blocks. This milestone indicates that they are starting to engage in more complex play, reflecting cognitive development as they learn about balance, gravity, and spatial relationships.

In contrast, younger children, such as those around 9 months, may still be in the phase of developing their grasp and may focus more on picking up and shaking or banging objects rather than stacking them. As for 15 and 18-month-olds, while they can certainly stack blocks, the ability to stack two blocks is typically achieved earlier in their development.