I didn't think we would really need them as mine were measuring 6 and 7lbs a few days before delivery but both of them drowned in the newborn so my mom got them some new preemie ones before we left the hospital. You can't go by weights really. They wore some of the preemie stuff up to 9lbs.I'm in the same boat as you- not sure. I've got twins and expected them to be small- so I'm going to pack both preemie and newborn sizes (just noticed my beautiful going home outfits are 0-3 oops!) but at my growth scan both are measuring big so may not need preemie lol. Stalking for advice!