4Moms MamaRoo Baby Bouncer Soother Rocker Seat! We've never seen a parent vibrate their child like a bouncy seat and hardly seen one swing a baby around like a swing. But, we've seen thousands of parents scoop their little ones up in their arms and bounce and sway. And that's what the Mamaroo does. It moves like you do. Some seats claim two motions, but really, they just turn their seat to the side. When we say unique we mean it. 5 different motions. 5 ways to soothe and entertain your little one. That's just better.