@Christina thank you so much x
My daughters were both born a bit over 8 pounds (8.6 and 8.4) and they fit nice and snug in newborn size if that helps :) didn't last very long though, maybe a few weeks.
@May thank you that helps massively 🥰
I'd bring some of both! Scans can be misleading and babies lose a little weight after birth so there really isn't a way to know what will fit and what won't. Newborn size is 5-8lbs so it's still very possible that could fit your baby on day one.