This way you can have one baby laying flat (newborn or infant having a nap) and another one sitting in upright position at the same time. (babygearhub.net)
This lightweight one is easy to hold it in upright position with your hands. (the-mule.com)
If your baby is facing acid reflux problems, then it is important to ensure that you keep him sitting upright for at least thirty minutes after feeding. (newkidscenter.com)