i don't think you'll need pads or undies. they have pads and disposable undies at the hospital. you'll be bleeding A LOT after delivery and you don't want to ruin yours... at least that's what our birth prep class teacher advised. she also suggested bringing your diaper bag empty. the diapers and diaper supplies are built into the cost of the room, so she suggested stocking up while you're there. i'm honestly more concerned with morgan's bag. i want to make sure he has a couple extra changes of clothes and plenty of snacks so he'll be comfy and won't have to come home constantly if i do end up in the hospital for awhile.