اَللّٰهُ یَعْلَمُ مَا تَحْمِلُ كُلُّ اُنْثٰى وَ مَا تَغِیْضُ الْاَرْحَامُ وَ مَا تَزْدَادُ وَ كُلُّ شَیْءٍ عِنْدَهٗ بِمِقْدَارٍ(۸)(سورۃ الرعد)
Translation
Whatever any female carries (in her womb), Allah knows it, and whatever decreases or increases in the wombs of the mothers, He knows that too, and everything with Him is by a determined measure. (Asan Tarjumat-ul-Quran)
Meaning: It is in the knowledge of Allah Almighty as to what kind of child is in which mother's womb, and whether the pregnancy is increasing or decreasing while remaining in the womb. (Asan Tarjumat-ul-Quran)