Many similar passages occur elsewhere.
Since physical birth in the Word symbolizes spiritual birth, and spiritual birth comes from the Lord, he is called our Maker and the one who delivered us from the womb, as is clear from the following passages.
Jehovah, who made you and formed you in the womb . . . (Isaiah 44:2)
You delivered me from the womb. (Psalms 22:9)
On you I was laid from the womb. You delivered me from my mother’s belly. (Psalms 71:6)
Listen to me, you whom I carried from the womb, whom I bore from the womb. (Isaiah 46:3)
There are other such passages as well.
This is why the Lord is called the Father, as in Isaiah 9:6; 63:16; John 10:30; 14:8, 9. This is why people who have received things that are good and true from the Lord are called “children of God” and “those who are born of God,” and why they are said to be siblings to each other (Matthew 23:8). This is also why the church is referred to as a mother (Hosea 2:2, 5; Ezekiel 16:45).
The above points make it clear that there is a correspondence between physical birth and spiritual birth. Because there is this correspondence, it follows that not only can we speak of this new birth as including stages of being conceived, being carried in the womb, being born, and being brought up, but those stages of our rebirth are actually real. What exactly the stages are, however, will be presented in proper sequence as this chapter on regeneration unfolds.
Here I will just mention that human seed is conceived inwardly within the understanding and takes shape within the will. From there it is transferred into the testicles, where it wraps itself in an earthly covering. Then it is delivered to the womb and finally enters the world.
There is also a correspondence between human regeneration and every aspect of the plant kingdom. This is why the Word portrays us as trees, the truth we have as seed, and the goodness we have as fruit.
A bad species of tree can be born anew, so to speak, and afterward bear good fruit and good seed; this is clear from grafting. Even though the bad sap rises from the root through the stem all the way to the point where the graft was made, it nevertheless turns into good sap and makes the tree good. A similar thing happens with people who are grafted onto the Lord, as he teaches with the following words: I am the vine; you are the branches. Those who live in me and I in them bear much fruit. If any do not live in me, they are cast out as branches. Once dried they are thrown into the fire. (John 15:5, 6)
Many scholars have pointed out the parallels between human reproduction and the reproduction not just of trees but of all plants. I will add something on the subject here to wrap up this discussion.
from Regeneration, Pages 55, 56