Protected with multiple layers.
The fetus is protected by three layers:
- Amnio-chorionic membrane.
- Abdominal muscle wall.
A fetus receives from the mother everything it needs of nutrients, oxygen... A fetus can even hear sounds however it cannot see anything because light cannot reach there. Light is the only thing that doesn't reach the fetus. This was known recently, however this was portrayed in the Quran 1400 years before it was discovered. The Quran says that the fetus sits inside three darkness's:
[Quran 39.6] He created you from one person, then made from it its mate, and brought down livestock for you eight kinds in pairs. He creates you in the wombs of your mothers, in successive formations, in a triple darkness. Such is Allah, your Lord. His is the kingdom. There is no god but He. So what made you deviate?
A fetus sits in complete darkness inside three protective layers.
How could an illiterate man who lived 1400 years ago have known that light is the only thing that doesn't reach the fetus?