The number of diapers your baby will use per day will depend on the age of the baby.
When a baby is a newborn they'll typically go through 10 to 14 diapers per day since a newborn baby poops and pees a lot.
As a baby gets to 5 to 6 months of age they typically use 5 to 7 diapers per day and as they reach a year or older the baby may only use 4 to 5 diapers per day since the older they get the less they poop and pee in their diapers.
Expect to change up to 14 diapers per day for a newborn baby though.