Girls Head chart in cms for babies 11 month old baby

Head circumference chart for 11-Month-Old girls

Tracking head growth for baby girls: what the percentiles mean at 11-Month-Old.

Head circumference percentiles for 11-Month-Old girls

The following percentile ranges are drawn from CDC growth standards for baby girls at 11-Month-Old:

• 5th percentile: 42.5 cm

• 25th percentile: 43.7 cm

• 50th percentile (median): 44.5 cm

• 75th percentile: 45.4 cm

• 95th percentile: 46.7 cm

The percentile values on this page are displayed in cm.

Percentile rankings compare your child's measurement against CDC reference data for baby girls. The 50th percentile is the median - the midpoint of all measurements in the reference group.

What to expect at 11-Month-Old

Eleven-month-old babies have undergone dramatic brain development since birth. Head circumference at this point is typically 10-12 cm larger than at birth.

Recording measurements over time

Continue recording head measurements at every health check and plotting them on the percentile chart. A sudden change in the rate of head circumference growth - either faster or slower than expected - warrants review. Trust your instincts: you are with your baby every day and are well placed to notice changes that a periodic check-up might not immediately capture.

Developmental milestones alongside head growth

As your baby becomes more mobile - sitting, crawling, pulling to stand - they naturally vary their head position throughout the day, which supports balanced skull shape. Ongoing brain development at this age is reflected in rapidly increasing social engagement, babbling, and purposeful hand use. If head circumference measurement concerns arise at a check-up, a paediatrician can assess the full developmental picture.

Frequently asked questions

What is a normal head circumference for this age?

The percentile table on this page shows the full range of typical head circumferences. All values from the 5th to the 95th percentile are within normal limits. As with all growth measurements, the pattern of growth over time is more informative than any single reading - a baby growing consistently at the 15th percentile is growing normally.

How fast does head circumference grow in the first year?

Head circumference grows approximately 10-12 cm in the first year of life - roughly 2 cm per month in the first 3 months, slowing to about 1 cm per month from 3-6 months, and 0.5 cm per month from 6-12 months. By 12 months, the average head circumference has grown from approximately 34-35 cm at birth to around 46-47 cm.

What is the fontanelle and when does it close?

The fontanelle is the soft spot on the top of a baby's head where the skull bones have not yet fused. There are two fontanelles: the larger anterior (front) fontanelle, which typically closes between 9 and 18 months, and the smaller posterior (back) fontanelle, which usually closes by 2-3 months. Both allow the skull to expand rapidly as the brain grows during the first years of life.

Data sources and methodology

The percentile ranges on this page are drawn from CDC growth chart data from the National Center for Health Statistics and WHO Child Growth Standards (for children under 5). CDC data published May 30, 2000, with 2022 extended BMI tables. Percentiles are modelled using the LMS method (Box-Cox transformation), which accounts for the skewed distribution of measurements at each age. All measurements are given in metric units with imperial equivalents.

These reference ranges are for general information only. A healthcare professional can provide personalised assessment based on the individual's growth pattern.