Humans create social bonds by sharing experiences (e.g., during rituals, listening to stories and watching movies together). But when do children become psychologically capable of bonding like this? How does this capacity manifest early in development? And is the family’s smartphone use, which tends to interfere with shared experiences, related to reduced sensitivity to children’s experience sharing? In a series of experiments, I will examine whether 9–18-month-olds act and feel more positively to their partner after sharing an experience, and if this reaction is related to the amount of smartphone use in the family.