Gymboree lied to me. Not Gymboree maybe but a Gymboree book. It was a book of baby games that I brought from the library. It lists age appropriate games for babies and it highly highly highly recommends a pillow mountain for babies who are just starting to scoot or do the little butt wiggle to crawl. The baby in the gymboree was just laughing and laughing trying to climb his pillow mountain while his mom looked on fondly! This is what my baby did