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.

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