God spare us from the new puritanism.  If the mother wants to have
champagne, she should have champagne and not "pump and dump".  (When
will we stop using that odious expression?).  She should breastfeed her
baby so that the salubrious mental effects of that wonderful liquid
nurtured on the limestone slopes of north-eastern France are not
disrupted by a physical relationship with a breast pump.

If alcohol is so dangerous in the tiny quantities it is present in the
milk, even after a bit of binge, then no one should be drinking it, not
fathers either.

Alcohol has a milk plasma ratio of 1.  Wine, champagne are about 12%
alcohol.  But the governments in most jurisdictions consider you too
drunk to drive if you have 0.08% in your blood.  Thus, a woman too drunk
to drive will have 0.08% alcohol in her blood, and in her milk.  The
effect of this is what exactly?

The alcohol does not stay in the milk, if, say the baby sleeps through
the night.  When the blood levels drop in the blood, the alcohol in the
milk will diffuse back into the blood and also be metabolized.

Jack Newman, MD, FRCPC