Facial features develop between the second and third months.
Human fetus 2-3 months
Facial features develop between the second and third months; before that the fetus is featureless. This was known recently, however this was portrayed in the Quran 1400 years before it was discovered.
٥ يَا أَيُّهَا النَّاسُ إِنْ كُنْتُمْ فِي رَيْبٍ مِنَ الْبَعْثِ فَإِنَّا خَلَقْنَاكُمْ مِنْ تُرَابٍ ثُمَّ مِنْ نُطْفَةٍ ثُمَّ مِنْ عَلَقَةٍ ثُمَّ مِنْ مُضْغَةٍ مُخَلَّقَةٍ وَغَيْرِ مُخَلَّقَةٍ لِنُبَيِّنَ لَكُمْ ۚ وَنُقِرُّ فِي الْأَرْحَامِ مَا نَشَاءُ إِلَىٰ أَجَلٍ مُسَمًّى ثُمَّ نُخْرِجُكُمْ طِفْلًا ثُمَّ لِتَبْلُغُوا أَشُدَّكُمْ ۖ وَمِنْكُمْ مَنْ يُتَوَفَّىٰ وَمِنْكُمْ مَنْ يُرَدُّ إِلَىٰ أَرْذَلِ الْعُمُرِ لِكَيْلَا يَعْلَمَ مِنْ بَعْدِ عِلْمٍ شَيْئًا ۚ وَتَرَى الْأَرْضَ هَامِدَةً فَإِذَا أَنْزَلْنَا عَلَيْهَا الْمَاءَ اهْتَزَّتْ وَرَبَتْ وَأَنْبَتَتْ مِنْ كُلِّ زَوْجٍ بَهِيجٍ
"Khilka خلقة " means features. "Mukhallaka مُخَلَّقَةٍ" means has features. "Khair Mukhallaka غَيْرِ مُخَلَّقَةٍ" means featureless. In this verse the fetus has features and is featureless. In another verse it says the fetus acquires those features after clothing the bones with flesh.
١٤ ثُمَّ خَلَقْنَا النُّطْفَةَ عَلَقَةً فَخَلَقْنَا الْعَلَقَةَ مُضْغَةً فَخَلَقْنَا الْمُضْغَةَ عِظَامًا فَكَسَوْنَا الْعِظَامَ لَحْمًا ثُمَّ أَنْشَأْنَاهُ خَلْقًا آخَرَ ۚ فَتَبَارَكَ اللَّهُ أَحْسَنُ الْخَالِقِينَ
In this verse the fetus acquires those features after clothing the bones with flesh. This turned-out to be the correct order of development, bones and muscles form before facial features. The vertebra is the first part of the skeleton to form however it is still made of cartilage. The first cartilage that turns into actual bone is the mandible (jaw bone). This Meckel's cartilage turns into bone 3 days before its respective muscles form:
The Meckel's cartilage in human embryonic and early fetal periods"The sequential development of the Meckel's cartilage started as early as stage 13 (32 days) with the appearance of condensation of mesenchymal cells within the mandibular prominence. During stage 17 (41 days), the primary ossification center of the mandible appeared on the inferior margin of the Meckel's cartilage. The muscular attachments to the Meckel's cartilage in embryos were observed at stage 18 (44 days)."
Wyganowska-Świątkowska M, Przystańska A. The Meckel's cartilage in human embryonic and early fetal periods. Anat Sci Int. 2011 Jun;86(2):98-107. doi:10.1007/s12565-010-0093-3. Epub 2010 Aug 27. PubMed PMID: 20799009.
The first formation of actual bones happens at the jaw bone at day 41. Three days later the associated muscles form. The facial features form during second and third months. No mistakes in the Quran.
How could an illiterate man who lived 1400 years ago have known that bones and muscles develop before facial features?
The Quran (Koran, the book of Islam) contains scientific knowledge that could not have been known 1400 years ago. It ranges from basic arithmetics to the most advanced topics in astrophysics. You are invited to go through those miracles and judge for yourself.