bring a baby out of the nest in their mouth and run round with it, is it normal or does it mean there is something wrong with it?

Too fast to see any wriggling, they are noisy during day/night presume when they are suckling but don't want to go in and disturb them as they are so small and pink so only young! Caught Scratch mid delivery yesterday so we have 2 new mums

Thanks Ellie x