My DD is 7.5 months. I think she'd really enjoy zooming about with a baby walker. I am not trying to artificially induce walking, as she will crawl or walk when she is ready and I am not into forcing her to the next stage; but I glean from MN that they are frowned on, as are playpens. Personally I think most things are ok as long as you don't use them for hours on end (she has enjoyed her baby bouncer swing for ages, for instance, but just for short periods) but if there is a compelling argument why these things are bad, I'd be interested to hear it...