Here’s the list on the effects due to fetal alcohol syndrome by the Mayo Clinic. According to them, FAS is simply a result of high blood alcohol levels in the fetus (as a result of undeveloped liver, etc), and so, From what i know about alcohol toxicity (which isn’t much, but i’ll try), the results are mostly physical damage (destruction of cells, mostly), and psychological (in terms of brain function impairment), and not genetically altering. As such, it should not be readily mutagenic. However, that’s the word of a biochemist, and not a doctor, so feel free to take that with a grain of salt.