Getting some space: Infants’ and caregivers’ containment and support spatial constructions during play

• By 18 months, infants create more containment than support spatial constructions.
• Infants’ input to spatial constructions differs from what they observe caregivers create.
• Caregivers label infants’ containment constructions more than support.

Using a cross-sectional design, we examined the containment and support spatial constructions infants spontaneously create and those they observe when playing with a nesting toy. Infants (N = 76) of 8, 13, or 18 months played alone for 2 min and then played with a caregiver for another 2 min. At 8 months, infants created few relations; at 13 months, they inserted objects, resulting in containment, and stacked objects, resulting in support; at 18 months, they created more than three times more containment relations than support relations, a result replicated in a second study. In contrast, caregivers created more support relations than containment relations, regardless of infant age, but labeled containment more than support. The results highlight differential exposure to containment and support in infant solitary and dyadic play. By 18 months, infants gain greater firsthand experience with containment, a relation that is further reinforced by caregiver labeling.