Surah Nuh 71:14

وَقَدْ خَلَقَكُمْ أَطْوَارًا

While He has created you in stages?

Translation: Saheeh International

Tafsir

when verily He created you in stages? atwār is the plural of tūr which means a state. Thus the sperm-drop is one state the blood clot is another state and so on until the creation of the human being is complete reflecting on the manner of his creation necessarily leads to belief in his Creator.

Excerpt from Tafsir al-Jalalayn, commentary on 71:14, via Quran.com. The reader has the full commentary and 9 more tafsirs.