Smooth motion of gliding backward and forward. You want a gliding / rocking action that mostly holds the kid level rather than dipping forward and backward. After a rough weeping session for your infant, this also makes the body calm. Large and dense padding on the armrests. This provides a nice surface to rest the arm when carrying the infant for probably many hours. Your arms are likely to fall asleep without this assistance. Reclining glider backrest that needs no effort.