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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.

    Online Medical Reviewer: Donna Freeborn PhD CNM FNP
    Online Medical Reviewer: Heather Trevino
    Online Medical Reviewer: Liora C Adler MD
    Date Last Reviewed: 3/1/2019
    © 2000-2019 The StayWell Company, LLC. 800 Township Line Road, Yardley, PA 19067. All rights reserved. This information is not intended as a substitute for professional medical care. Always follow your healthcare professional's instructions.
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