Question: When does the soul enter the body?
Sri Chinmoy: Between six and eight months before birth is the usual time for the soul to enter into the body. On rare occasions it may enter at the time of conception. The latest time for the soul to enter is usually about thirteen or fourteen days before the child is born. In very rare cases the soul enters into the body just two or three days before birth and sometimes it may even come shortly after birth. At that time the soul may be waiting until the last moment before making a decision because it is doubtful about the family. Some souls feel that by waiting for a longer time they will be able to make a better decision. Again, some souls simply take longer to make the decision just as some people take more time to make a decision than others. But some souls don’t wait; they know immediately what to do and it is done within a few months after the time of conception.
Sri Chinmoy, Eternity's Soul-Bird, part 1, Agni Press, 1974