Baby's Measurements, Explained

Pediatricians can learn a lot about how well your baby is growing from these three measurements, says Jennifer Shu, MD, coauthor of Heading Home with Your Newborn. Your doctor will take these at every checkup, starting at birth.

Measurement: Head Circumference

It tells doctors that baby's brain is developing correctly.

Average at birth: 14 inches

3 months: 16 inches

6 months: 17 inches

12 months: 18 inches

All measurements are on average.

    Measurement: Length

    It tells doctors that baby's bones are growing properly.

    Average at birth: 20 inches

    3 months: 24 inches

    6 months: 26 inches

    12 months: 29 inches

    All measurements are on average.

      Measurement: Weight

      It tells doctors that baby is eating enough.

      Average at birth: 7.5 pounds

      3 months: 12 pounds

      6 months: 16 pounds

      12 months: 22 pounds

      All measurements are on average.

      Originally published in the December 2008 issue of American Baby magazine.

      All content on this Web site, including medical opinion and any other health-related information, is for informational purposes only and should not be considered to be a specific diagnosis or treatment plan for any individual situation. Use of this site and the information contained herein does not create a doctor-patient relationship. Always seek the direct advice of your own doctor in connection with any questions or issues you may have regarding your own health or the health of others.