The complexities of human reproduction were decoded and understood only after the invention of the microscope, which was invented hundreds of years after the death of Muhammad, peace be on him. But the Qur'an refers to all the stages through which the human embryo passes. As Allah says:� Verily, We created man from the quintessence of mud. Then We placed him as a drop of sperm in a safe depository. Then We fashioned the drop of sperm into a thing that clings, and then We fashioned the thing that clings into a chewed lump (of flesh), and We fashioned the chewed flesh into bones. Then We clothed the bones with (intact) flesh. Then We developed it into a different (form of) creation. So blessed be Allah, the best of creators.�
The observations of modern science indicate the stages of human reproduction are:
1. Fertilization of an ovule, which takes place in the Fallopian tubes. The fertilizing agent is the male sperm.
In conclusion, Dr. Bucaille ascertains:"More than a thousand years before our time , at a period when whimsical doctrines still prevailed, men had a knowledge of the Qur'an. The statements it contains express in simple terms primordial truths that man has taken centuries to discover by himself."
2. The implantation of the fertilized egg, which takes place at a precise spot in the female reproductive system. It descends into the uterus and lodges in the body of the uterus. Once the embryo begins to be observable to the naked eye, it looks like a small mass of flesh. It grows there in progressive stages well known today, which lead to the bone structure, the muscles, the nervous and circulatory system, and the viscera, etc.
The Bible, the Qur'an and Science, p.199.