When parents think about a second child, they often imagine that the older one will become support for the baby, a helper, and the best friend. But in practice, the arrival of a newborn often turns into a test for the whole family: the older child may experience jealousy, a sense of injustice, and hurt, and then it can spill over into conflicts and rivalry between the children, overshadowing the joy of parenthood. Laura Markham, a child psychologist and a well-known parenting specialist with extensive experience, offers a proven approach that helps adults handle children’s quarrels confidently and calmly and build relationships with each child based on respect and understanding.