A mount assembly includes a playpen frame, a support frame that can provide support for a bassinet in the playpen frame, and multiple bar segments to provide support for a utility accessory positioned side-by-side relative to the bassinet. The playpen frame includes two first upper side rail assemblies each having a fixed wall, and a second upper side rail assembly connected with the two first upper side rail assemblies. The support frame includes two connectors operable to respectively attach to and detach from the fixed walls. Each connector is formed to include a socket. The two connectors can attach to the fixed walls respectively near a middle of the two first upper side rail assemblies. The bar segments are mountable to the playpen frame, one of the bar segments once mounted to the playpen frame having an end portion resting in contact with the socket of one connector.