Breastfed newborns through two month olds can expect to have 5—7 wet and 1—5 soiled diapers a day. Beyond two months, a breastfed baby will continue to have 3—5 wet diapers a day and have a stool every 1—4 days. Formula-fed babies should also have about 3—5 wet diapers a day and at least one stool every four days. If not, check with your care provider.