The vinyl cushion is 6" high for use by children 5months to 5 years. It provides a little extra support to larger children.
The unique square design allows the infant to push against the sides to do a sit up and get into the crawl position while on her belly. Later on, she can continue to use it during her favorite activities.
It is safe, because it's firm, but soft, and it will withstand years of tough use.
Your child will love learning in her Sitting Square!