Allah knows what every female bears, and by how much the wombs fall short (of their time or number) or exceed. Everything with Him is in (due) proportion (8)All-Knower of the unseen and the seen, the Most Great, the Most High (9)

Allah affirms His perfect knowledge, from which nothing is hidden, and that He has complete knowledge of whatever every female creature is carrying,

وَيَعْلَمُ مَا فِي الْأَرْحَامِ

(And He knows that which is in the wombs.)[31:34], whether male or female, fair or ugly, miserable or happy, whether it will have a long or a short life. Allah said in other Ayat,

هُوَ أَعْلَمُ بِكُمْ إِذْ أَنشَأَكُم مِّنَ الْأَرْضِ وَإِذْ أَنتُمْ أَجِنَّةٌ

(He knows you well when He created you from the earth, and when you were fetuses.)[53:32], and,

يَخْلُقُكُمْ فِي بُطُونِ أُمَّهَاتِكُمْ خَلْقًا مِّن بَعْدِ خَلْقٍ فِي ظُلُمَاتٍ ثَلَاثٍ

(He creates you in the wombs of your mother: creation after creation in three veils of darkness.)[39:6] meaning stage after stage. Allah also said,

وَلَقَدْ خَلَقْنَا الْإِنسَانَ مِن سُلَالَةٍ مِّن طِينٍ - ثُمَّ جَعَلْنَاهُ نُطْفَةً فِي قَرَارٍ مَّكِينٍ - ثُمَّ خَلَقْنَا النُّطْفَةَ عَلَقَةً فَخَلَقْنَا الْعَلَقَةَ مُضْغَةً فَخَلَقْنَا الْمُضْغَةَ عِظَامًا فَكَسَوْنَا الْعِظَامَ لَحْمًا ثُمَّ أَنشَأْنَاهُ خَلْقًا آخَرَ ۚ فَتَبَارَكَ اللَّهُ أَحْسَنُ الْخَالِقِينَ

(And indeed We created man out of an extract of clay. Thereafter We made him as a Nutfah in a safe lodging. Then We made the Nutfah into a clot, then We made the clot into a little lump of flesh, then We made out of that little lump of flesh bones, then We clothed the bones with flesh, and then We brought it forth as another creation. So Blessed is Allah, the Best of creators.)[23:12-14]

In the two Sahihs it is recorded that 'Abdullah bin Mas'ud said that the Messenger of Allah ﷺ said,

إِنَّ خَلْقَ أَحَدِكُمْ يُجْمَعُ فِي بَطْنِ أُمِّهِ أَرْبَعِينَ يَوْمًا، ثُمَّ يَكُونُ عَلَقَةً مِثْلَ ذَلِكَ، ثُمَّ يَكُونُ مُضْغَةً مِثْلَ ذَلِكَ، ثُمَّ يَبْعَثُ اللهُ إِلَيْهِ مَلَكًا فَيُؤْمَرُ بِأَرْبَعِ كَلِمَاتٍ، بِكَتْبِ رِزْقِهِ، وَعُمْرِهِ، وَعَمَلِهِ، وَشَقِيٌّ أَوْ سَعِيدٌ

(The matter of the creation of one of you is put together in the womb of the mother in forty days, and then he becomes a clot of thick blood for a similar period, and then a piece of flesh for a similar period. Then Allah sends an angel who is ordered to write four things. He is ordered to write down his provisions, his life span, his deeds, and whether he will be blessed or wretched.") In another Hadith, the Prophet ﷺ said,

فَيَقُولُ الْمَلَكُ: أَيْ رَبِّ أَذَكَرٌ أَمْ أُنْثَى؟ أَيْ رَبِّ أَشَقِيٌّ أَمْ سَعِيدٌ؟ فَمَا الرِّزْقٌ؟ فَمَا الْأَجَلُ؟ فَيَقُولُ اللهُ: وَيَكْتُبُ الْمَلَكُ

(Then the angel asks, "O my Lord! Is it a male or a female, miserable or happy, what is its provisions and life span?" Allah then ordains and the angel records it.) Allah said next,

وَمَا تَغِيضُ الْأَرْحَامُ وَمَا تَزْدَادُ

(and by how much the wombs fall short or exceed.) Al-Bukhari recorded that 'Abdullah bin 'Umar said that the Messenger of Allah ﷺ said,

مَفَاتِيحُ الْغَيْبِ خَمْسٌ، لَا يَعْلَمُهُنَّ إِلَّا اللهُ: لَا يَعْلَمُ مَا فِي غَدٍ إِلَّا اللهُ، وَلَا يَعْلَمُ مَا تَغِيضُ الْأَرْحَامُ إِلَّا اللهُ، وَلَا يَعْلَمُ مَتَى يَأْتِي الْمَطَرُ أَحَدٌ إِلَّا اللهُ، وَلَا تَدْرِي نَفْسٌ بِأَيِّ أَرْضٍ تَمُوتُ، وَلَا يَعْلَمُ مَتَى تَقُومُ السَّاعَةُ إِلَّا اللهُ

(The Keys of the Ghayb (unseen knowledge) are five, nobody knows them but Allah. Nobody knows what will happen tomorrow except Allah; nobody knows what is in the womb except Allah; nobody knows when it will rain except Allah; no soul knows at what place he will die except Allah; and nobody knows when the (Final) Hour will begin except Allah.) Al-'Awfi reported from Ibn 'Abbas that he said,

وَمَا تَغِيضُ الْأَرْحَامُ

(and by how much the wombs fall short), this refers to miscarriages,

وَمَا تَزْدَادُ

(or exceed), this refers to carrying her fetus in her womb for the full term. Some women carry their fetus for ten months, while others for nine months. Some terms are longer or shorter than others. This is the falling short or exceeding that Allah the Exalted mentioned, and all this occurs by His knowledge." Qatadah commented on Allah's statement,

وَكُلُّ شَيْءٍ عِندَهُ بِمِقْدَارٍ

(Everything with Him is in proportion.) "For a term appointed. Allah has the records of the provisions and terms of His creation and made an appointed term for everything." An authentic Hadith mentioned that one of the Prophet's daughters sent (a messenger) to him requesting him to come as her child was dying, but the Prophet ﷺ returned the messenger and told him to say to her,

إِنَّ للهِ مَا أَخَذَ، وَلَهُ مَا أَعْطَى، وَكُلُّ شَيْءٍ عِنْدَهُ بِأَجَلٍ مُسَمًّى، فَمُرُوهَا فَلْتَصْبِرْ وَلْتَحْتَسِب

(Verily, whatever Allah takes is for Him and whatever He gives is for Him, and everything with Him has a limited fixed term (in this world), and so she should be patient and hope for Allah's reward.) Allah said next,

عَالِمُ الْغَيْبِ وَالشَّهَادَةِ

(All-Knower of the Ghayb (the unseen) and the Shahadah (the witnessable),) Who knows everything that the servants see and all what they cannot see, and none of it ever escapes His knowledge,

الْكَبِيرُ 

(the Most Great), greater than everything,

الْمُتَعَالِ

(the Most High.) above everything,

قَدْ أَحَاطَ بِكُلِّ شَيْءٍ عِلْمًا

((Allah) surrounds all things in (His) knowledge.)[65:12], and has full power over all things, the necks are under His control and the servants are subservient to Him, willingly or unwillingly.