I think kellymom has info on this. I started having 1 cup a day after I nursed DS. I think he was probably a month old when I started (but I also had 1 cup a day pg). Now I can have two cups in the morning and it still doesn't seem to effect him (2 8oz cups). I think 300 mg is the limit.
I have a cup or two of coffee and a couple of other drinks a day. I am so exhausted from being up all night I don't know how I would stay awake without it. I do cut out the caffeine during the night.
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I have quite a bit a day. Like 1.5-2 cups in the morning and at least another cup in the afternoon. I try to time it, especially if I'm at work, and pump right before I have a cup, but I haven't noticed any impact on DD one way or the other.
Re: Caffeine