It says "vitually all omeprazole ingested via milk would probably be destroyed in the stomach of the infant prior to absorption"
Hey Mom06, I know this is an old post but wanted to share my two cents of advise with people who may be visiting this page in future. Most doctors are of the opinion that Nexium medicine is constrained only within the body and doesn't pass along with the breast milk. So in usual circumstances, it is safe to take. I had also recently written a blog post detailing the effects that Nexium can have on breastfeeding and pregnant women - http://www.choicechemist.com/should-pregnant-or-breastfeeding-women-consume-nexium
Hope this is useful to people searching in this regard :)