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Physical Development, Ages 1 to 12 Months

Table of Contents


Topic Overview

Babies grow rapidly during the first year of life. Weight, length, and head circumference measurements are plotted on growth charts to monitor your baby's growth over time. Most babies:

The soft spots, or fontanelles, on top of a baby's skull begin to close at 6 months but won't completely grow together until sometime between the 9th and 18th month.

When your baby is about 6 months old, teething may begin. Teeth may not yet break through the gums at this age, but your baby may drool, chew on objects or hands, and act fussy from the pressure of new teeth coming in.

It is important to keep in mind that each baby is different, and growth patterns can change between routine well-child checkups. If you have concerns, talk to your doctor about the many things that can affect your baby's growth. Physical growth requires adequate nutrients and a nurturing environment.


Credits for Physical Development, Ages 1 to 12 Months

Current as of: September 20, 2021

Author: Healthwise Staff
Medical Review:
John Pope MD - Pediatrics
Kathleen Romito MD - Family Medicine
Louis Pellegrino MD - Developmental Pediatrics


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