By their second year, their weights are typically similar. Over the course of the first year, healthy breastfed babies tend to gain more slowly than formula-fed infants. While breastfed infants may gain more quickly in the first few months, formula-fed babies gain more rapidly after that. (Although not all babies follow this timeline, and a growth spurt can happen at any time!)Īfter the first month, a baby typically gains about 3 to 5 ounces a week until 12 months. Look for more growth spurts around 2 to 3 weeks, and at 6 weeks, 3 months, and 6 months. (When a baby wants to eat again soon after a full feeding, it's called cluster feeding.) For example, you may notice your baby wants to eat more often or for longer when they're between 7 and 10 days old, when they're having a growth spurt. Many factors go into a baby's weight gain in those first weeks of life, including how fast your breast milk comes in (if you're breastfeeding) and how much your baby wants to eat. They also grow about 1 to 1.5 inches (2.54 to 3.81 centimeters) in height during this month. By the end of the first month, most babies will weigh between 1 and 2 pounds above their birth weight. In the first month, newborns typically gain about an ounce (30 grams) daily, or a total of 5 to 7 ounces a week. How much weight will a newborn gain in the first weeks after birth?īabies usually start to gain weight again 5 to 7 days after birth, and most should be back to (or above) their birth weight by the time they're about 2 weeks old. Being small or large at birth doesn't mean your baby will be small or large later in life. Other factors include the baby's health and gestational age ( premature babies are often smaller), whether the baby is a boy or girl, a first baby or later baby, or a singleton or multiple. About 7.5 percent of babies are born with a high birth weight.Ī newborn's weight depends on a number of factors, including the parents' size and ethnicity, Mom's health and age, and how much Mom gained during pregnancy. In 2020, 8.24 percent of babies were born low birth weight, and 1.34 percent were born very low birth weight (less than 1,500 grams, or 3 pounds 4 ounces).Ī high birth weight means that a baby weighs 4,000 grams (8 pounds 13 ounces) or more. Low birth weight is considered less than 2,500 grams (5 pounds, 8 ounces). 5,000 grams or more (11 pounds or more): 0.10 percent.4,000 to 4,499 grams (8 pounds 13 ounces to 9 pounds 15 ounces) 6.50 percent.3,500 to 3,999 grams (7 pounds 11 ounces to 8 pounds 13 ounces): 26.16 percent.3,000 to 3,499 grams (6 pounds 10 ounces to 7 pounds 11 ounces): 38.91 percent.2,500 to 2,999 grams (5 pound 8 ounces to 6 pounds 10 ounces): 19.14 percent.2,000 to 2,499 grams (4 pounds 7 ounces to 5 pounds 8 ounces): 5.29 percent.1,500 to 1,999 grams (3 pounds 5 ounces to 4 pounds 7 ounces): 1.61 percent.1,000 to 1,499 grams (2 pounds 3 ounces to 3 pounds 5 ounces): 0.71 percent.500 to 999 grams (1 pound 2 ounces to 2 pounds): 0.49 percent.499 grams or less (less than 1 pound 2 ounces): 0.13 percent.
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