How much weight per week should my baby be gaining?

4 oz to 8 oz. Average baby gains about 1 to 2 lb a month . How ever every baby is different. Minimum weight gain should be at least a 4 oz /week.
About 1 oz per day. Most babies in the first few months will gain about 1 ounce per day after returning to birthweight. Most babies double their birthweight by 5-6 months of age.