I can't say enough about this product. My infant has horrible GI reflux(sees a specialist and takes medicine). As a result, we weren't able to put her down much or use any of her bouncers, car seats, swings, or Rock n play sleeper ------ until we found this. He little wedge is great. Just slide it in the "cave" ad it helps push your child's bum up so hey are more flat. For us this product is a godsend. It won't get rid of reflux but it does make it more manageable.