According to Kabbalah, it is customary to have a copy of Psalm 121 in the delivery room during labor and at the time of birth. These holy passages arouse God’s mercy for an easy birth and delivery.
Another reason given for this custom is that in this way, a child’s Jewish education begins at birth. The first images the child is surrounded with are Jewish holy objects. Later, these holy verses are placed within the baby’s crib (in a safe manner), on the doorway to the baby’s bedroom, and on the front door of the home.