23+ How Much Weight Should An Infant Gain Background. The average newborn gains 2/3 to 1 ounce a day and grows 1 to 1 1/2 inches in length over the course of the whole month. If that's not the case, says marchand, the baby and how she is feeding should be assessed by a doctor.
The newborns are usually gains approx 0.7 (20 g) daily or about to gain approx 4 (110 g) to 8 oz (226.8 g) in a week in the first month.
From ages 6 to 12 months, a baby might grow 3/8 inch (about 1 centimeter) a month and gain 3 to 5 ounces (about 85 to 140 grams) a week. So how much weight should a baby gain per week? A baby with a gestational age of 24 weeks (born after the 24th week of pregnancy) may attain five grams per day while those born at 33 weeks or later can put on as much as 30 grams per day. If you were of a normal weight range when you became pregnant, your target weight gain should range between 25 to 35 pounds.