I researched this for you and found this info online:
The term "nonalcoholic" is a bit misleading when it comes to the supposedly alcohol-free versions of beer and wine. In fact, all "nonalcoholic" beers and many nonalcoholic wines do contain some alcohol, typically less than half a percent. While few would say that the trace amount of alcohol in an occasional glass of nonalcoholic beer is going to harm your baby, it's something to be aware of - especially if you drink these beverages often or in large amounts. So before you drink up, read labels carefully and remember that "nonalcoholic" and "alcohol-free" aren't interchangeable terms: Drinks labeled nonalcoholic can contain trace amounts of alcohol, while those labeled alcohol-free can't.
Basically, I read this as meaning that nonalcoholic beer is fine every once in a while, just don't have too much too often.