Verš 71:14

On přece stvořil vás v postupných formách;

Tafsir al-Jalalayn

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.