My daughter is very small and has skinny legs.  We have the hardest time finding socks that stay on.  These ones come up to the top of her calf and fit so snugly, they are in the same spot at the end of the day.  I can see how they might be too tight though, for normal-size or chubby babies.  If your kid is small though, these are the best socks I've found, compared to roll-cuff and other crew socks.