When does the essence enter the body? At conception? At birth?
As with all things human this varies. The essence never enters at conception because the newly conceived body is just too boring and primitive for the essence to be interested in being in it. The expansive essence is guiding the process of development like a cook preparing a meal, watching the temperature, adding ingredients, etc. But the cook is not in the cake or in the vegetables cooking on the stove. In fact the body is not developed enough to host the essence until the third trimester. Sometimes the essence begins to enter partially at six months but even then being in a womb is rather dull. Most of the time essence fully enters the body at the first breath at birth. Even then, sometimes the essence does not occupy the body and if it does not within a couple of days, the infant will suffer crib death because a body cannot live outside the womb without an essence in it.
Older souls can experience a great deal of frustration when occupying a body after birth because life as an infant can be so boring and limiting. The essence is ready to take on the world but mostly it is just a big round of nursing, pooping, and peeing. They sleep a lot to relieve the boredom and frustration at not being able to control their movements. With greater mastery over the body they are happier and more content. Some people think that old souls make good babies but often they don’t. Yogananda reported that he screamed during the first six months of his life. Imagine the frustration of that great soul stuck in a helpless infant’s body.
Much of the craziness about pro life and pro choice could be resolved if only people understood the true dynamics of when the essence enters the body.