AP PSYCHOLOGY

Detailed explanation-1: -The average newborn weight at birth in the U.S. is around 7.5 pounds. Any birth weight between 5.5 pounds and 10 pounds is seen as normal (1). This healthy average weight range applies to babies born between 37 weeks to 40 weeks and 6 days.

Detailed explanation-2: -The average birth weight for babies is around 3.5 kg (7.5 lb), although between 2.5 kg (5.5 lb) and 4.5 kg (10 lb) is considered normal. In general: Boys are usually a little heavier than girls. First babies are usually lighter than later siblings.

Detailed explanation-3: -Girls (at 7 pounds, 1 ounce/3.2 kg) are a bit smaller than boys (at 7 pounds 8 ounces/3.4 kg) on arrival. The average newborn is 19 1/2 inches (49.5 cm) long, with girls measuring 19.4 inches (49.2 cm) and boys measuring 19.7 inches (49.9 cm).

Detailed explanation-4: -The average weight for full-term babies (born between 37 and 41 weeks gestation) is about 7 pounds (3.2 kg). In general, small babies and very large babies are more likely to have problems. Newborn babies may lose as much as 10% of their birth weight.

Detailed explanation-5: -Newborns come in a range of healthy sizes. Most babies born between 37 and 40 weeks weigh somewhere between 5 pounds, 8 ounces (2, 500 grams) and 8 pounds, 13 ounces (4, 000 grams). Newborns who are lighter or heavier than the average baby are usually fine.