Okay for 12 week old to sleep in this?

Laura

Hi friends! We were given a used Grace pack n play. Is it okay for our 12 week old to sleep on his back in a swaddle in this? I ask because we’ve only ever had him sleep in a Bassinet by our bed and haven’t used a pack n play yet. The pack n play mattress seems softer and cushier than the bassinet mattress. Thanks in advance!