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      Newborn Measurements

      Assessing a newborn's weight

      A baby's birthweight is an important indicator of health. The average weight for full-term babies (born between 37 and 41 weeks gestation) is about 7 lbs (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 birthweight. This means that a baby weighing 7 pounds 3 ounces at birth might lose as much as 10 ounces in the first few days.

      Your newborn will be weighed in the hospital and at all check-ups. In most cases, metric units are used to record babies' weight. This chart will help you convert the metric unit grams (g) to pounds (lb) and ounces (oz).

      Converting grams to pounds and ounces

      1 lb. = 453.59237 grams; 1 oz. = 28.349523 grams; 1000 grams = 1 kg.

      Pounds

      Ounces

      2

      3

      4

      5

      6

      7

      8

      9

      0

      907

      1361

      1814

      2268

      2722

      3175

      3629

      4082

      1

      936

      1389

      1843

      2296

      2750

      3203

      3657

      4111

      2

      964

      1417

      1871

      2325

      2778

      3232

      3685

      4139

      3

      992

      1446

      1899

      2353

      2807

      3260

      3714

      4167

      4

      1021

      1474

      1928

      2381

      2835

      3289

      3742

      4196

      5

      1049

      1503

      1956

      2410

      2863

      3317

      3770

      4224

      6

      1077

      1531

      1984

      2438

      2892

      3345

      3799

      4252

      7

      1106

      1559

      2013

      2466

      2920

      3374

      3827

      4281

      8

      1134

      1588

      2041

      2495

      2948

      3402

      3856

      4309

      9

      1162

      1616

      2070

      2523

      2977

      3430

      3884

      4337

      10

      1191

      1644

      2098

      2551

      3005

      3459

      3912

      4366

      11

      1219

      1673

      2126

      2580

      3033

      3487

      3941

      4394

      12

      1247

      1701

      2155

      2608

      3062

      3515

      3969

      4423

      13

      1276

      1729

      2183

      2637

      3090

      3544

      3997

      4451

      14

      1304

      1758

      2211

      2665

      3118

      3572

      4026

      4479

      15

      1332

      1786

      2240

      2693

      3147

      3600

      4054

      4508

      What other measurements are taken of the newborn?

      Like weight, length and head circumference help your baby's healthcare provider get an idea of his or her overall health. They may also be measured using metric units, centimeters (cm) instead of inches (in). To convert inches to centimeters: 1 in = 2.54 cm.

      • Head circumference. The distance around the baby's head:

        • The average newborn's head measures 13 3/4 in (35 cm)

        • Generally, a newborn's head is about half the baby's body length in cm plus 10 cm. So a baby that is 18 inches long would be 45.7 centimeters (18 x 2.54). His or her head would be about 32.9 cm or a little under 13 inches.

      • Length. The measurement from top of the head to the heel of one foot:

        • The average newborn is about 50 cm or 19 3/4 in long.

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