The embryo attaches itself to the mother to feed, just like a leech attaches itself to a host to feed.
The embryo also looks like a leech:
The embryo looks like a leech, but these pictures are magnified by microscope. This was known recently, however this was portrayed in the Quran 1400 years before it was discovered.
Then We developed the semen into a leech. Then We developed the leech into a lump. Then We developed the lump into bones. Then We clothed the bones with flesh. Then We produced it into another creature. Most Blessed is Allah, the Best of Creators.
١٤ ثُمَّ خَلَقْنَا النُّطْفَةَ عَلَقَةً فَخَلَقْنَا الْعَلَقَةَ مُضْغَةً فَخَلَقْنَا الْمُضْغَةَ عِظَامًا فَكَسَوْنَا الْعِظَامَ لَحْمًا ثُمَّ أَنْشَأْنَاهُ خَلْقًا آخَرَ ۚ فَتَبَارَكَ اللَّهُ أَحْسَنُ الْخَالِقِينَ
"Alaqa عَلَقَةً" means leech. It turned-out that the embryo looks like a leach. Then later it develops into a "Mudgha مُضْغَةً" meaning something chewed. It turned-out that at week 6 the vertebra of the embryo looks likes something chewed.
Today we know that the vertebra of the embryo looks like something chewed. No mistakes in the Quran.
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