Last pregnancy I brought two or three outfits in varying sizes because both of our mothers were all "You guys are going to have a huge baby!". We are pretty tall individuals. We also had almost zero newborn clothes.
Low and behold I give birth to a premie sized baby girl weighing in at a whopping 5 lbs 10oz. And she went home with sleeves and cuffs rolled up to the hilt. She's still a petite little thing to this day.