I bought these to use on my newborn for the first few weeks while his cord healed.  He was SWIMMING in them! at 8 lbs!  They are definitely for fatter/heavier/larger newborns.  Now that my son is nearly 3 months, they are STILL a bit large and I don't need them.  Next time I will buy something made just for newborns.  Other than the large size, they are soft & comfy for baby with a thick enough material to add a little warmth for baby.