Infant attachment
Most of the time, the people who take care of a baby are the baby's mother and father.  If the mother or the father comes when the baby cries and treats the baby with tenderness, the baby learns that the parents will take care of it. If the mother or the father smile at the baby, talk to the baby, sing to the baby, and hold the baby even when it is not crying, the baby learns that the parents love it.  When a baby has learned that it is loved and that it will be taken care of if it cries, it usually grows up to be a person who expects other people to be nice.  When a child feels loved and cared for and thinks other people will be nice, that child is said to be securely attached.