Stop drinking six months before conception.

Can alcohol affect sperm? Dads-to-be should stop drinking 6 months before conception, study finds

Alcohol consumption during pregnancy has long been linked to congenital defects and developmental problems in newborns. Now a new study has found a link between a baby's congenital heart defects and their prospective parents' drinking before conception

Compared to non-drinkers, fathers who drank during the three months before conception were 44% more likely to have babies born with congenital heart disease.

If the prospective dads were binge drinkers, which was defined as downing five or more drinks per session, there was a 52% higher likelihood their baby would have a congenital heart defect.

(read the rest of the article at above link)

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Sobering news, no pun intended. Even though I'm no scientist, it makes sense.  Alcohol IS, after all, technically a poison.

OTOH, I suspect a LOT of "conception events" are directly due to alcohol consumption.