
Why kids notice favoritism so early
Sibling rivalry can begin astonishingly early. Children can notice differences in parental treatment from about one year of age.Sibling Rivalry: Why It Starts So Early

They are not just fighting over toys
Many children are also trying to define who they are inside the family. They want to feel separate and significant, not just like someone's brother or sister.Sibling Rivalry: Why It Starts So Early