Bassinets and changing-table inserts can be useful. Just remember that you should never leave your child unattended within those devices in a play yard—no matter what type (or feature) you are using. Your infant may be content to sleep in her bassinet insert, but she's safest sleeping in a full-sized crib. That's because your child may begin moving around and could fall out of the bassinet, either onto the floor, or to the floor of the play yard, causing injury. You'll also need to remove the bassinet or changing station, (or flip the changing station to the outside of the yard, depending on the model) when your baby is in the main part of the play yard to avoid the possibility of the child getting trapped under those attachments.
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