When Alex was just a couple months old we purchased this Fisher Price play gym for him. He could lay on his back and look up at the toys and he loved it. I forgot that it could also turn into a tunnel once he was older. He hadn't been playing with it much, but I got it out yesterday and made it into the tunnel, and it was a big hit with all the kids! They had a great time playing all day with it.
Alex was content to just sit inside and play with the toys. Drew and Faye of course had to show him how to crawl through it!