Jesse, IIRC from the beginning reading I've done, some babies are less than keen on mom's breast milk after an onion- or garlic-heavy meal, but many more babies don't care. And most of what the mom eats gets processed heavily in the making of breast milk, with the potentially problematic stuff making it through in only trace amounts, so the crazy pregnancy dietary restrictions are lifted. Plus, yay!, the horrible maternal heartburn thing is a pregnancy-only problem -- once the baby is no longer inside the woman, crushing her stomach into halfway up her esophagus, she can usually go right back to eating whatever she ate before.
So, in short, unless you were planning on bringing your friend a carton of Kools, some gin and a bag of crack, you're probably fine (also maybe avoid the garlic-onion-stinky-cheese pie until the baby is weaned).
However, and I cannot stress this enough, I've read like one and a half books and experienced no actual childbearing or -feeding as yet, so this entire post is really oh so very ex cloaca.
