The origins of infants’ fairness concerns and links to prosocial behavior

•Infants expect resources to be distributed equally to recipients.•Infants evaluate individuals based on their adherence to fairness norms.•Sharing experience may drive the developmental acquisition of fairness norms.•Later, variability in the nature of infants’ sharing predicts fairness concerns.•Limitations exist in infants’ fairness concerns: they do not punish unfair agents.