I bought this toy when my son was just over 6 months old and crawling. The tubular construction is padded so it is easy on the knees.  Another thing that made it a great choice is the peek windows that allow the child to see you or crawl towards where they hear your voice.  My son is now almost 5 and it is still one of his favorite toys.  He and his friends pull it out and have a blast.  The best thing is that it is so well made that it is still in great shape.  My son was a late in life child so we are able to buy just about anything we want for him, and we do. (Although we do rotate and give to charity quite often to keep him from having too much) So when I say this is in the top 5 of all the toys ever....it is saying something.  So much so that I am ordering another one for our 7 month old nephew for Christmas.