Is lack of a philtrum due to an alcoholic mother?

A lack of a philtrum, or a smooth upper lip, can be a characteristic of fetal alcohol spectrum disorders (FASD), which occur when a mother consumes alcohol during pregnancy. This condition can lead to various facial abnormalities, including a diminished or absent philtrum. However, other genetic or environmental factors can also affect philtrum development, so it's not exclusively linked to maternal alcohol consumption. It's important for a medical professional to assess each individual case.