When does the development of the human face o in what week of pregnancy?

The development of the human face begins early in pregnancy, around the 4th week, with the formation of the facial structures from various embryonic tissues. By the end of the 8th week, the basic features of the face, including the eyes, nose, and mouth, are recognizable. This period is crucial for proper facial development, as any disruptions can lead to congenital abnormalities.