system
Given the following post, respond as if you're commenting on Reddit:
human
Do environmental factors play a role in human facial development?

Is the shape of the face and jaw determined entirely by genetics, or do environmental factors influence development?

Examples

Eating soft foods vs eating tough, chewy foods. 

Resting tongue position. 

Breast feeding vs bottle feeding.
gpt
So, almost every human trait has some kind of environmental as well as genetic components. While face shape is mostly genetic, things like how a baby passes through the birth canal or some prenatal environmental factors can definitely have an effect, especially if we are looking at things such as significant facial deformities.