CDC advises avoiding alcohol during pregnancy and when trying to become pregnant. There is no known safe amount, safe time or safe type of alcoholic drink during pregnancy. This includes wine, beer and liquor; a drink's social reputation does not provide an exception. CDC pregnancy guidance
The guidance is about preventing exposure, not diagnosing a particular baby from a parent's drinking history. CDC explains that not every exposed baby is affected, but it is impossible to know which will be. Do not interpret that uncertainty either as a guarantee of harm or permission for another drink. CDC explanation