If you have a newborn baby in your home, you would see a certain part of the skull is not formed. Have you noticed this? So the child has to be handled gently. That part is just skin, there is no bone. So this part, in the yogic terminology is referred to as Brahmarandhra. Randhra means a passage. Like a small hole, or a tunnel, or a passage. So this is known as Brahmarandhra. So this is the space in the body through which life descends into the fetus.
Because life has descended into the fetus, and life keeps its options open. Whether this body is capable of sustaining it or not, it keeps the options open. That much awareness is there in the life process. So it keeps that trap door open till the last minute. It wants to keep it open, just in case it finds the body unsuitable for its existence, it will leave. And it does not want to leave from any other passage in the body, it wants to leave the way it came. A good guest always comes through the front door, and goes out through the front door. If he comes through the front door, and goes out through the back door – that means your house is swept clean. So he wants to go out to the same door, so he keeps it open till the last minute – he wants to keep his choices.
There are any number of – probably if there are doctors or obstetricians you would know – there any number of cases where, by all medical parameters the fetus is healthy, everything is fine. But for some reason a stillbirth happens. Simply because a life within is still choosing. If it finds the wrong kind of body is happening – life has its own karmic substance – and the fetus has the karma of the parents. So it has made its choice, 90% of the time it is correct. Or more… it is correct. Sometimes it is conscious that it could make a wrong choice. So, if a being enters into this particular fetus, and finds it unsuitable as it evolves – to become a baby – then it leaves. That is why one door is kept open. So, this is the brahmarandra.