Babies understand fairness by 15 months

 "As well as being able to tell whether people are being treated even handedly, babies just over a year old are capable of basic altruism, or trying to help others even at their own expense.
Being able to sense that a situation is unequal made babies more willing to share their favourite toys, a new study found, suggesting that fairness and altruism are linked.
Previous research had shown that two-year-olds could help others and that at about six or seven children have a sense of fairness, but a new experiment indicated that the traits may develop even earlier."
via Telegraph /read more