In order to have a clear conception of the great earnestness manifested among all the Israelites for children, it should be remembered that this was with an eye to the coming Messiah. That promised seed every Israelite was extremely anxious should spring from his family. Hence Gehazi concluded that a son would be so highly esteemed a blessing. And hence the Shunammite's expressions of joy were so lively.
Related Commentaries of 2 Kings 4:14
2 Kings 4:14-17
14 And he said, What then is to be done for her? And Gehazi answered, Verily she hath no child, and her husband is old.
15 And he said, Call her. And when he had called her, she stood in the door.
16 And he said, About this season,c according to the time of life, thou shalt embrace a son. And she said, Nay, my lord, thou man of God, do not lie unto thine handmaid.
17 And the woman conceived, and bare a son at that season that Elisha had said unto her, according to the time of life.