Do not use the play yard once your baby has outgrown it: Stop using the play yard right from the day your baby outgrows the recommended age. You may be tempted to use it for some more days or weeks but this can be very dangerous since play yards are designed to meet the specific height and weight requirements of babies of certain age. The build materials may not be able to sustain the increased weight of a baby who has outgrown the recommended age of the playard thus posing a risk of injury.
So, playpen, childproof room, fully free range, or something else? Are playpens cages of disregard or safe, useful accoutrements? How much time is too much time? Will a playpen keep my daughter out of the Ivy League? When I asked Alison Gopnik, professor of psychology at University of California-Berkeley and author of the just-released book The Philosophical Baby, about any work on the negative consequences of playpens, her answer was instructive: “I don’t know of any systematic research on this,” she noted, adding, “Ironically these small kinds of parenting differences, which are just the things parents care about most, are just the areas where scientists wouldn’t expect to see many differences.”
Nice to keep baby out of trouble at home. Once he became mobile we had to do an "upgrade" as we noticed he was starting to hit his head on the X shaped metal bars. We tried some alternatives but the best so far was wrapping the metal bars with pool noodles (see picture). You'll need 8 pool noodles and some cuts (buy some extra in case you mess up). Use 2/3 of a pool noodle to wrap the internal bars and the remaining 1/3 to wrap half of the external bar. The pieces will also need a longitudinal cut along the length to fit the bar in. You'll also need some small cuts in the middle of the longer piece to fit the center rivet, where the mesh is attached to the bars. We got the pool noodles at the dollar store nearby for less than $10 and since ... full review