I guess I was slow in introducing tunnels. My first attempt (around 10 months) was not well received, so I didn’t try again until J was 12 months. I just set up the couch cushions to create a short tunnel and he loved it. He liked to follow mommy through (though it was a tight fit for mommy!), play peek a boo with mom at one end and J at the other, push his cars through the tunnel, or pop his head up through the top of the tunnel. It’s an easy activity to set up and free!
Age attempted? 10 months not successful (cautious little guy!); successful at 12 months and ever since
Try Again? Yes; still a good activity