First-time parents are famous for worrying about each stage of their new child's development. Is the child learning to walk on schedule? Talk on schedule? Is he or she "normal"? With subsequent children, however, parents are usually more relaxed, in part because they now know more about how children typically develop. Knowledge about development gleaned from experience with previous children may also make second-, third-, or fourth-time parents quicker to catch genuine problems in development than are first-time parents.