You see his lips quiver and his eyes well up with tears. This 9-month-old has never cried before when his parents brought him to the baby room at church. All of a sudden, he bursts into tears when his mom hands him into your arms. You recognize that he is going through separation anxiety. This is a tough stage for the preschooler to go through, but it marks another milestone in his mental development which also has an impact on spiritual development.