7.25 pounds The average newborn weighs 7.25 pounds.
1 Age 1 year: 21-32 lbs, mean: 10 kg (22 lb). 
2 Age 2 years: 23-35 lbs, mean: 13 kg (28 lb). 
3 Age 3 years: 27-39 lbs, mean: 15 kg (33 lb). 
4 Age 4 years: 30-43 lbs, mean: 17 kg (37 lb). 
5 Age 5 years: 34-52 lbs, mean: 19 kg (42 lb). 
6 Age 6 years: 39-61 lbs, mean: 21 kg (46 lb).
Birth. The average newborn is 19.5 inches long and weighs 7.25 pounds. Boys have a head circumference of about 13.5 inches and girls measure in at 13.3 inches, according to the National Center for Health Statistics. 1  Baby Growth Charts: Calculate Height and Weight. 2  Charting Baby's Development. Kids will grow about 2 inches and gain 4 pounds each year until puberty (usually between 8 and 13 for girls and 10 and 14 for boys). Girls often reach their full height about two years after their first period. Boys usually hit their adult height around age 17. Newborn Baby birth weight At full term, the avarage baby will be about 20 inches (51 cm) long and will weigh approximately 6 to 9 pounds (2700 to 4000 grams). - During a normal pregnancy your baby will grow and develop at about the same rate as any other pregnancy. Checking that your baby fits into this range can reassure you that he is within the normal range of height, weight and head circumference measurements for his age. But to track whether your baby is growing adequately over time, you will need to use a chart that shows his growth curve and percentile. To know more about what growth charts mean and how they are used, please see our article on growth charts: understanding the results. This chart gives the measurement range between the 3rd and 97th percentile of the WHO growth standards for baby boys. As you’ll see, there’s now a much broader range of what’s “normal” than there was at earlier ages. At fifteen months, the average girl weighs about 23 pounds (10.5 kg) and is almost 30.5 inches (77 cm) tall; the average boy weighs about 24.5 pounds (11 kg) and is 31 inches (78 cm) tall. Over the next three months, they’ll each gain approximately 1 1⁄2 pounds (0.7 kg) and grow about an inch (2.5 cm). 1 Expect your baby to double his or her birth weight by about age 5 months. 2  From ages 6 to 12 months, a baby may grow 3/8 inch (about 1 centimeter) a month and gain 3 to 5 ounces (about 85 to 140 grams) a week. 3  Expect your baby to triple his or her birth weight by about age 1 year. 1 From ages 6 to 12 months, a baby may grow 3/8 inch (about 1 centimeter) a month and gain 3 to 5 ounces (about 85 to 140 grams) a week. 2 Your child's size and growth timeline. Lots of parents wonder whether their child is bigger or smaller than other kids the same age. To give you a benchmark, here are the values from the 25th percentile to the 75th percentile for weight and height – meaning that half of kids fall within these ranges. A quarter of kids fall above these numbers and a quarter of kids below them. Exam: Normal Weight in boys (range: 3% to 97%). 1  Age 1 year: 21-32 lbs, mean: 10 kg (22 lb). 2  Age 2 years: 23-35 lbs, mean: 13 kg (28 lb). 3  Age 3 years: 27-39 lbs, mean: 15 kg (33 lb). 4  Age 4 years: 30-43 lbs, mean: 17 kg (37 lb). 5  Age 5 years: 34-52 lbs, mean: 19 kg (42 lb). 6  Age 6 years: 39-61 lbs, mean: 21 kg (46 lb).  The royal baby, weighing in at 8lb 6oz, is larger than the average, although the average birth weight of UK babies is increasing - 7lb 8oz for boys (up 2oz since Middle of the Road were driving us mad with their cheeping in 1971) and 7lb 4oz for girls (up 1½oz).  Small for gestational age (SGA) babies are those whose birth weight lies below the 10th percentile for that gestational age. Low birth weight (LBW), is sometimes used to define a baby that weighs less than 5 lb 8 oz (2500 g) regardless of gestational age. At full term, the avarage baby will be about 20 inches (51 cm) long and will weigh approximately 6 to 9 pounds (2700 to 4000 grams). - During a normal pregnancy your baby will grow and develop at about the same rate as any other pregnancy. 1 From birth to age 6 months, a baby may grow 1/2 to 1 inch (about 1.5 to 2.5 centimeters) a month and gain 5 to 7 ounces (about 140 to 200 grams) a week. 2  Expect your baby to double his or her birth weight by about age 5 months. 1 From ages 6 to 12 months, a baby may grow 3/8 inch (about 1 centimeter) a month and gain 3 to 5 ounces (about 85 to 140 grams) a week. 2  Expect your baby to triple his or her birth weight by about age 1 year.
http://www.parents.com/toddlers-preschoolers/development/physical/age-by-age-growth-chart-for-children/ http://www.baby2see.com/baby_birth_weight.html http://www.babycenter.in/a1052194/baby-boys-growth-chart-0-to-12-months https://healthychildren.org/English/ages-stages/toddler/Pages/Physical-Appearance-and-Growth-Your-1-Year-Old.aspx http://www.mayoclinic.org/healthy-lifestyle/infant-and-toddler-health/expert-answers/infant-growth/faq-20058037 http://www.babycenter.com/0_your-childs-size-and-growth-timeline_10357633.bc http://www.fpnotebook.com/Endo/Exam/WghtMsrmntInChldrn.htm http://www.bbc.co.uk/news/uk-23403391 http://www.baby2see.com/baby_birth_weight.html http://www.mayoclinic.org/healthy-lifestyle/infant-and-toddler-health/expert-answers/infant-growth/faq-20058037
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