What is SAM and MAM in the pediatric growth chart?

SAM (Severe Acute Malnutrition) = Weight-for-Age or BMI-for-Age Z-score below -3SD. MAM (Moderate Acute Malnutrition) = Z-score between -3SD and -2SD. SAM requires immediate therapeutic feeding intervention; MAM requires supplementary feeding.

What is stunting in children?

Stunting is defined as low Height-for-Age. A child is considered stunted if their Z-score is below -2SD, and severely stunted if below -3SD. Stunting reflects chronic undernutrition and is assessed using WHO growth reference standards.

What is the WHO growth chart Z-score?

A Z-score (standard deviation score) shows how far a child's measurement deviates from the median of a reference population. Z = 0 is the median (50th percentile). Z = -2 is the 2.3rd percentile. Z = +2 is the 97.7th percentile. A Z-score below -2 is considered below the normal healthy range.

What head circumference is normal for a newborn in India?

Normal head circumference at birth is 33-37 cm based on the WHO reference. A measurement below 33 cm may suggest microcephaly (Z-score below -2SD), while above 37 cm may suggest macrocephaly. Head circumference is measured routinely up to 2 years of age.

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📈 WHO · IAP 2015 · Free · India

WHO & IAP Growth Chart
Calculator — India

Calculate pediatric weight, height, BMI and head circumference Z-scores with SAM/MAM/stunting classification. Uses WHO charts (0–5 years) & IAP 2015 guidelines (5–18 years).

Weight-for-Age Height-for-Age BMI-for-Age Head Circumference Z-Score · Percentile SAM · MAM · Stunting

Child growth monitoring in India uses the WHO Multicentre Growth Reference Study (MGRS) 2006 standards for infants and children aged 0–5 years, and the Indian Academy of Pediatrics (IAP) 2015 reference charts for older children and adolescents aged 5–18 years. This pediatric calculator computes the precise Z-score (standard deviation score) and percentile for your child's measurements, and classifies their nutritional status according to standard clinical definitions.

📊 Enter Child's Measurements

Date of Birth

Biological Sex

Measurement Type

Weight (kg)

Age

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Z-Score

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Percentile

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Z-Score Position

-3 SD
SAM-2 SD-1 SDMedian+1 SD+2 SD+3 SD

📚 Clinical Classification Reference — WHO/IAP Z-Score Cutoffs

⚖ Weight-for-Age (Undernutrition Classification)

Z-Score	Classification	Clinical Action
Below -3 SD	SAM Severe Acute Malnutrition	Immediate referral for therapeutic feeding (NRC/hospital)
-3 to -2 SD	MAM Moderate Acute Malnutrition	Supplementary nutrition programme, close monitoring
-2 to -1 SD	Mildly Underweight	Dietary counselling, follow-up in 1 month
-1 to +1 SD	Normal	Continue routine care
+1 to +2 SD	Possible Risk of Overweight	Dietary review, physical activity counselling
Above +2 SD	Overweight	Dietary counselling, rule out endocrine cause
Above +3 SD	Obese	Detailed assessment, rule out pathological cause

📈 Height-for-Age (Stunting Classification)

Z-Score	Classification	Implication
Below -3 SD	Severely Stunted	Chronic severe undernutrition, early childhood
-3 to -2 SD	Stunted	Chronic undernutrition, irreversible if prolonged
-2 to -1 SD	Mildly Stunted	Nutrition/genetic factors, monitor
-1 to +2 SD	Normal	Routine care
Above +2 SD	Tall	Usually normal variant; rule out precocious puberty if early

📈 Pediatric BMI-for-Age (Wasting / Overweight)

Z-Score	Classification	Clinical Action
Below -3 SD	SAM / Severe Wasting	Immediate therapeutic feeding, NRC referral
-3 to -2 SD	Wasting / Thinness	Supplementary feeding, nutritional rehabilitation
-2 to +1 SD	Normal	Routine care
+1 to +2 SD	Possible Overweight	Dietary and activity counselling
Above +2 SD	Overweight / Obese	Full assessment, rule out childhood obesity pathology

● Infant Head Circumference-for-Age (0–2 Years)

Z-Score	Classification	Clinical Action
Below -3 SD	Severe Microcephaly	Urgent neurology/genetics referral
-3 to -2 SD	Microcephaly	Neurological evaluation, developmental assessment
-2 to +2 SD	Normal	Routine care
Above +2 SD	Macrocephaly	Rule out hydrocephalus; family HC measurement helpful

❓ FAQs — Pediatric Growth Charts India

What is SAM and MAM in the growth chart?+

SAM (Severe Acute Malnutrition) is defined as a Weight-for-Age or BMI-for-Age Z-score below -3SD. MAM (Moderate Acute Malnutrition) is a Z-score between -3SD and -2SD. SAM requires immediate referral to a Nutrition Rehabilitation Centre (NRC) or hospital. MAM requires supplementary nutrition programmes and close community monitoring.

What is stunting and how is it different from wasting?+

Stunting is a low height-for-age (Z-score below -2SD) and reflects chronic, long-term undernutrition. Wasting is low weight-for-height or low pediatric BMI-for-age, which reflects acute, recent undernutrition. A child can be both stunted and wasted simultaneously. Stunting is much harder to reverse once it occurs past age two.

What is the WHO Z-score and how is it calculated?+

A Z-score (standard deviation score) shows how far a child's measurement is from the median of a healthy reference population. Z = 0 is the exact median (50th percentile). Z = -2 is the 2.3rd percentile. Z = +2 is the 97.7th percentile. This calculator uses the WHO LMS reference methodology.

What is the difference between WHO and IAP growth charts in India?+

WHO growth charts (MGRS 2006) represent optimal growth in healthy, breastfed children across all ethnicities and are used for ages 0–5 years. The Indian Academy of Pediatrics (IAP) 2015 charts are explicitly tailored for Indian children aged 5–18 years, as they better reflect ethnic growth and pubertal patterns during school age and adolescence in India.

What is the normal head circumference for a newborn in India?+

Normal head circumference at birth is approximately 33–37 cm (WHO reference median = 34.5 cm for boys, 33.9 cm for girls). A measurement below -2SD may suggest microcephaly. Above +2SD may suggest macrocephaly or familial large head. Head circumference is measured routinely at every pediatric visit up to 2 years.

At what age is BMI-for-age used instead of weight-for-age in India?+

BMI-for-age is the preferred index for identifying overweight, obesity, and acute malnutrition (wasting) in children over 2 years of age. For children who are unusually tall or short for their age, BMI-for-age provides a far more accurate picture of their current nutritional status than weight-for-age alone.

About WHO & IAP Growth Charts for Indian Children

Growth charts are essential tools for monitoring child health and development in India. The WHO Multicentre Growth Reference Study (MGRS) provides the gold standard for infants and children aged 0–5 years, while the Indian Academy of Pediatrics (IAP) 2015 growth charts are officially recommended for children aged 5–18 years in the Indian context. These pediatric charts plot weight, height, and BMI against age to calculate Z-scores — statistical measures that indicate how far a child's measurement deviates from the healthy median for their specific age and biological sex.

A Z-score between −2 and +2 is considered normal. A Z-score below −2 indicates undernutrition (underweight, stunting, or wasting), while a score below −3 signals severe acute malnutrition (SAM) requiring urgent medical intervention. Conversely, Z-scores above +2 for pediatric BMI-for-age indicate overweight, and scores above +3 indicate childhood obesity.

In India, stunting (low height-for-age) affects a significant percentage of children under 5, reflecting chronic undernutrition. Wasting (low BMI-for-age) indicates acute malnutrition and is the primary criterion for SAM diagnosis. Regular plotting on growth charts at every well-child visit — monthly in infancy, quarterly thereafter — enables early detection of growth faltering before severe clinical signs appear.

The IAP 2015 reference uses LMS methodology (lambda-mu-sigma) to construct accurate, age- and sex-specific centile curves for the Indian demographic. BMI-for-age Z-score is the universally preferred index for identifying overweight and obesity in children over 2 years, replacing simple weight-for-age. This calculator automatically seamlessly bridges both standards, computing Z-scores using WHO Anthro data for children under 5 and IAP 2015 references for older children and adolescents.

Related Clinical Tools

Disclaimer: This calculator uses WHO MGRS 2006 reference data (0–5 years) and IAP 2015 reference data (5–18 years) with linear interpolation. Results are approximate. Always verify against official plotted growth charts for clinical decisions. Z-scores are estimates and should be interpreted alongside physical clinical examination. This tool does not replace professional medical assessment.

WHO & IAP Growth ChartCalculator — India