Quoting Brittany Nolan:" About how big is baby too big for newborn clothes? That's all I have packed & I'm not sure if I should ... [snip!] ... 5lbs7oz. U/s tech said he could gain a half a pound to a pound every week until delivery. I'm worried he is going to be huge!"
they have no idea how big your baby is. Honestly. Don't stress. It wouldn't hurt to take a few newborn sized outfits and a few 0-3 months. They're tiny so they don't take much space and then no matter what size the baby is, you're covered. My son was 8lbs 4 oz and we just let him wear a hospital shirt home and had a bklanket on him in the car. It was spring so it was warm