Congratulations on your upcoming arrival of a new baby! You are going to fall in love. I have that exact same playpen for my new baby Lexi & it has been a God send. I hope you find it as helpful as I have. I think it is a perfect setup with pee pad & puppy crate attached too. I hope you have a foolproof method of attaching the crate to the playpen as these little ones are Houdini's.
I would hate to see the puppy get caught & stuck in between where it may be attached.