The baby in the womb does not digest and metabolise it's own food by ingesting, chewing and processing, but the rew materials for its development and growth are provided via the umbilical cord from outside the baby, directly absorbed into the baby's bloodstream. So in that sense its food processor is outside. At birth, breathing begins and the baby begins to take responsibility for digesting and transforming food into flesh and bone. The baby starts to demand food rather than just passively absorbing it.
Is it possible that regeneration, receiving the word of God, the incorruptible seed, equates to conception, when the ovum receives the seed of the man; and being born again equates to water baptism, where the believer leaves the womb of the world and begins to take responsibility for learning to feed him/herself and digest the word him/herself, and to dress himself, showing forth works worthy of repentance towards God?