There is no greater joy than having a child. From a religious perspective, bringing new life into this world is the most tangible way of demonstrating that we were created in G-d’s image. The initial biblical portrayal of G-d is that of a Creator. And the first mitzvah given to man is to be fruitful and multiply and to conquer the earth, mandating us to imitate and partner with G-d in the continuing process of creation. The Torah describes the great joy, and the subsequent party, when Yitzchak was born. A primary theme of sefer Breisheet is the yearning for children.
There is no event more awe-inspiring than the birth of a baby. It is the closest we can come to acting like G-d, creating something from nothing. It is no coincidence that, soon after the Torah tells the story of creation, man is given the command Pru Urvu—to be fruitful and multiply—joining with G-d in the process of creation.