I've read that one to two cups a day of coffee is "ok". But more than that and there could be negative effects on the baby's development. The way I see it, if more than one or two cups is bad, why even have any? Why take the chance? Is it really worth it to drink coffee and take the risk, no matter how small, that it will have a negative impact on the fetus? I suppose you would want to abstain while pregnant and then if breast feeding abstain until no longer breast feeding. After all, there is a reason we don't give coffee to babies and children. Put it another way, if you wouldn't give your newborn baby coffee or even your toddler or young child coffee, why would you give it to your fetus?