We are one among the fastest growing species which is occupying this world. We are changing the dynamics of the nature. We are torturing mother earth for our every day livelihood. We are reshaping her at our own will. We are churning the ocean and causing imbalance in sea life. We are completely commanding the rest of the animals on the earth. They are living on our mercy. We are treating them like machines. We are deciding when they should take birth, what they should eat, when they should die... etc... etc. Any way we call it civilization.
We are in competition with our own fellows (that is the law of course). We don't have to time to listen to the problems of our own parents, our own brothers and sisters, our own kids, our own relatives and our own friends. Leave it, we don't have time to even know our own SELF.
Why not help one poor soul into this world instead of bringing a new one? There is no shortage of unfortunate kids in this world. But the big question is who is ready to practice it? No woman want to sacrifice her motherhood.
This reminds me of a mythological story in Valmiki Ramayanam. All the Devata's asks Lord Siva to promise that he will not bear any kids through Parvathi. Agreeing to which Lord Shiva discharges his Shakti to Bhoomi. Bhoomi could not hold it and passes it on to Agni. Coming to know about this Parvathi curses all the Devata's that they will never become parents again. Thats why our Devatha count is always constant. She also curses Bhoomi that she will have many husbands, and also her sons will become her husbands (King is Bhoomi pati... and his son also becomes Bhoomi pati). If you don't know this story, listen to Valmiki Ramayanam Balakanda.
No woman in this world would like to sacrifice her motherhood. It is a mistake even to expect that kind of sacrifice from them unless the girl has some real purpose. If you happen to know any woman who is putting this practice, convey my salute to her (or if you are the woman who is reading, I salute you).
Don't ever suggest this to your spouse if you don't have kids already. Even Parvathi Devi couldn't bear that thought, we are mere mortals.