Interpretation, Head Circumference Measurement, Failure-to-Thrive Evaluation,
Familial Short Stature Analysis, Constitutional Growth Delay, Pediatric Weight-
Loss Etiologies, Abnormal Growth Curve Interpretation, Head Growth Pattern
Assessment, Dysmorphic Feature Identification, Neurologic Developmental
Screening, Pediatric Blood Pressure Classification, Prehypertension
Identification, Stage-1 Hypertension Diagnosis, Stage-2 Hypertension Diagnosis,
Early Childhood Caries Prevention, Fluoride Varnish Application, Dental Plaque
and Enamel Assessment, Orthopedic History Evaluation, Genu Varum
Identification, Genu Valgum Developmental Patterns, Pubertal Tanner Staging,
Pubic Hair Development Stages, Female Breast Development Stages, Male
Genital Development Stages, Testicular Volume Measurement Exam Questions
Verified and Provided with Complete A+ Graded Rationales Latest Updated 2026
Percentiles
In the standardized scale for all children, all weights between the 5th and 85th percentiles are
considered normal. As important as the fact that a child's weight falls between these percentiles on a
growth chart is that over time the weight follows one of the percentile curves. In other words, a child
who is at the 80th percentile for the first time he or she is weighed and is at the 40th percentile a month
later is cause for concern. A child is defined as having a failure to thrive syndrome (a medical diagnosis)
if height and weight drops below the third percentile on a standardized growth chart
BMI growth chart ages
2 to 20
how to measure head circumference
generally measured on infants and children until the age of 3 years
· Measure over the largest circumference of the head, namely the most prominent part of the back of
the head (occiput) and just above the eyebrows (supraorbital ridges)
· Pull the tape snugly to compress the hair and underlying soft tissues. Read measurement to the nearest
0.1cm or 1/8 inch and record on the chart
, · Reposition the tape and remeasure the head circumference. The measure should agree within 0.2cm or
¼ inch. If the difference between the measures exceeds the tolerance limit, the infant should be
repositioned and remeasured a third time. The average of the 2 measures in closest agreement is
recorded
· Head circumference should correlate with the child's length (eg, if length is in the 40th percentile, head
circumference should also be 40th percentile)
What to do with abnormal
Children who fall off their height curves (decline in stature/length percentiles or present with extreme
short stature) may need to undergo evaluations for underlying medical problems
First make sure accurate
Calculate mean parental height and plot (add parental heights and subtract 5 inches for a girl (from
dad's height) or add 5 inches (to mom's height) for a boy, and then divide that entire number by 2
If the child is short, but mean parental height falls in the same percentile, the child may have familial
short stature
If the parents entered puberty late and the child is short and prepubertal at a time when most children
are in puberty, he or she may have constitutional delay
These children all need to be followed closely and evaluated or referred to an appropriate specialist
Those with short stature may need to be assessed for endocrinopathies, pubertal delay, boney
dysplasias, or syndroems. Pubertal delays may be genetic/familial or be due to and underlying medical
condition
conditions associated with weight loss or fall off weight growth curves
malabsorption
renal disease
cardiac disorders
neurologic and pulmonary disorders
food or feeding abnormalities
family or environmental difficulties
chronic infections