Glossary
79 terms parents actually need to understand the labels, the pediatrician visits, and what their child is eating. Clinically-defensible, written for parents — not for doctors.
For children and teens, BMI is interpreted as a percentile against age- and sex-matched peers, not the adult BMI category. A pediatrician calls a child's BMI 'healthy weight' between the 5th and 85th percentile, 'overweight' from 85th to 95th, and 'obese' at or above the 95th. Adult BMI categories (e.g. 'BMI 30 = obese') do not apply to children.
A reference plot of height, weight, head circumference, or BMI against age, used to track whether a child is growing on a steady curve. Pediatricians use the WHO chart for children under 2 and the CDC chart for ages 2–19. The trend matters more than any single point.
A short period of rapid height and weight gain. Most children have spurts in infancy, around ages 6–8, and again at puberty. Appetite and food volume increase noticeably, which is normal — restricting calories during a spurt is harmful.
Accelerated growth that occurs after a period of slowed growth (illness, undernutrition, prematurity), as the body returns to its expected curve. Catch-up growth requires temporarily higher calorie and protein intake than maintenance.
A clinical term for a child whose weight or height has dropped meaningfully below their expected growth curve over time. It is a signal to investigate causes (medical, nutritional, social), not a diagnosis itself. Pediatricians evaluate this; parents should not self-diagnose.
Defined in the US as BMI at or above the 95th percentile for age and sex. Linked to higher lifetime risk of type 2 diabetes, heart disease, and joint problems. Roughly 1 in 5 US children meets the definition, and the prevalence has tripled since the 1980s.
International growth reference for children under age 5, published by the World Health Organization in 2006. Built from data on healthy, breastfed children of multiple ethnicities, it describes how children *should* grow rather than how they happen to grow in any one population. The AAP recommends using WHO standards for children under 2 in the US.
US national growth reference for children, last revised in 2000, used by pediatricians for ages 2 to 19. Unlike the WHO standards, the CDC charts are descriptive — they reflect how a representative US population grew historically, including periods of higher overweight prevalence.
When a child's weight or height curve crosses one or more percentile lines on the growth chart, either upward or downward, over time. A single crossing in early infancy is often normal; persistent crossing in either direction is a signal to investigate, especially when downward.
A growth metric comparing a child's weight to same-age peers. Sensitive to recent nutrition and illness, but less informative than weight-for-length in infancy, when growth can be in length rather than weight.
For infants and toddlers, comparing weight to length is more meaningful than weight alone. A child can be tall and lean (low weight-for-age, normal weight-for-length) or short and stocky (normal weight-for-age, high weight-for-length); the proportion is what pediatricians track for under-twos.
For children under age 2, length (measured lying down) rather than standing height is the relevant linear-growth measure. Length-for-age below the 5th percentile sustained over time can suggest chronic undernutrition, genetic factors, or underlying medical issues warranting workup.
A child who consistently refuses many foods, eats a narrow range, or reacts strongly to new textures, smells, or appearances. Some pickiness is developmentally normal between ages 2 and 6. Persistent or severe selectivity past that age may warrant pediatric or feeding-therapy evaluation.
The reluctance to try unfamiliar foods. It peaks between ages 2 and 6 and is evolutionarily protective. Repeated, low-pressure exposure is the most evidence-backed way to expand a child's food range — not coercion or hiding foods.
A phase where a child eats only one or two foods, often for days or weeks, then abruptly drops them. Common between ages 2 and 5. Counter-strategies: keep offering variety alongside the favored food; do not over-serve the favored food.
The principle that children need to encounter a new food many times — often 10–15 — before they accept it. 'Encounter' includes seeing, touching, smelling, or tasting; full bites are not required. Pressure to finish a serving slows acceptance.
A feeding philosophy from registered dietitian Ellyn Satter: parents decide what, when, and where food is served; the child decides whether to eat and how much. Reduces mealtime conflict and supports better long-term self-regulation.
Foods most associated with pediatric choking deaths: whole grapes, hot dogs, hard candy, popcorn, raw carrots, large chunks of cheese or meat, peanuts. Risk is highest under age 4. Modify shape (quartered grapes, ground meat) rather than avoid the food category.
A feeding style where caregivers respond to the child's signals of hunger, fullness, and food preference rather than imposing a schedule or quantity. Endorsed by the WHO and AAP for infants and young children; supports self-regulation and reduces later mealtime conflict.
The signals a child gives to indicate fullness — turning away, closing the mouth, slowing down, pushing food away, losing interest. Responsive caregivers learn to read these and stop offering food when they appear, supporting the child's ability to recognize their own hunger and fullness.
Serving food in shared bowls on the table from which everyone serves themselves, rather than pre-plating each child's portion. Allows children to choose what to take and how much, supports self-regulation, and exposes them to foods other family members eat without pressure.
A feeding-therapy technique for picky eaters where a child's accepted food is gradually linked to similar but slightly different foods through small bridges — color, shape, texture, brand. Used to expand a narrow diet without forcing entirely unfamiliar foods.
A pattern where specific food sensory properties (texture, smell, temperature, appearance) trigger genuine distress or refusal rather than preference. More common in autistic children and in some neurodivergent profiles; often improves with feeding therapy that respects the sensory dimension rather than treating it as defiance.
The three nutrients the body needs in large quantities: protein, carbohydrates, and fat. Each provides energy (calories) and structural building blocks. Children need all three; restrictive diets that eliminate one (e.g. low-fat for under-2s) can stall growth.
Vitamins and minerals the body needs in smaller quantities — but no less critical for growth. Common deficiencies in children: iron, vitamin D, calcium, zinc, iodine. Picky eaters and selective vegans/vegetarians are at higher risk and may need supplementation.
Builds tissue, immune cells, hormones, and enzymes. Children need roughly 0.95 g/kg/day (ages 4–13). A parent doesn't usually need to track grams — meeting protein at every meal (egg, dairy, meat, beans, tofu) almost always covers it.
Required for red blood cells and brain development. Iron-deficiency anemia is the most common nutritional deficiency in toddlers, especially after weaning from iron-fortified formula. Sources: red meat, fortified cereal, beans, dark leafy greens. Pair with vitamin C for absorption.
Builds bone density during the rapid skeletal growth of childhood and adolescence. Daily targets: ~700 mg for ages 1–3, ~1000 mg for 4–8, ~1300 mg for 9–18. Sources: dairy, fortified plant milks, leafy greens, sardines.
Needed to absorb calcium; also supports immune function. Made in skin from sunlight, but most children do not get enough — the AAP recommends 400 IU/day from infancy. Deficiency is widespread, especially in winter and in children with darker skin.
A family of essential fatty acids (ALA, EPA, DHA) involved in brain and eye development. Best sources: fatty fish (salmon, sardines), walnuts, chia, flax. The AAP recommends 1–2 fish servings per week from age 2.
A nutrient critical for brain development, often overlooked because it is not a vitamin or mineral. Sources: eggs, beef, salmon, dairy, soybeans. Many children fall short of the daily target (ages 4–8: 250 mg; 9–13: 375 mg).
Indigestible plant material that supports gut health and bowel regularity. Daily target by age: roughly 'age + 5' grams (e.g. a 6-year-old needs ~11 g). Whole grains, fruit, vegetables, beans, and seeds. Most American children get half what they need.
A trace mineral essential for growth, immune function, and wound healing. Daily targets: ~3 mg ages 1–3, ~5 mg ages 4–8. Best sources: meat, poultry, dairy, beans, fortified cereal. Deficiency is uncommon in well-fed US children but can occur with restrictive diets or malabsorption.
A mineral involved in over 300 biochemical processes, including muscle and nerve function. Children commonly fall short of the target (80–130 mg/day depending on age). Sources: leafy greens, nuts, seeds, whole grains, legumes.
Critical for vision, immune function, and cell growth. Comes in two forms: preformed (animal sources — eggs, dairy, liver) and provitamin A carotenoids (orange and dark green vegetables). Deficiency is rare in the US but a leading cause of preventable childhood blindness globally; excess from supplements is toxic.
A fat-soluble vitamin required for blood clotting. Newborns are routinely given a vitamin K shot at birth to prevent vitamin K deficiency bleeding, a rare but serious condition. After infancy, dietary intake from leafy greens and fermented foods is usually adequate.
A B vitamin (B9) essential for DNA synthesis and cell division. Found in leafy greens, legumes, fortified grains. Most US flour is fortified with folic acid, which has substantially reduced childhood folate deficiency since the 1990s. Especially important before conception and in early pregnancy.
Required for nerve function and red blood cell formation. Found almost exclusively in animal products — meat, eggs, dairy, fish. Vegan and strict vegetarian children require reliable B12 supplementation; deficiency in infancy can cause permanent neurological damage.
A trace mineral essential for thyroid hormone production, which regulates growth and metabolism. Iodized salt provides most of the iodine in the US diet; children avoiding iodized salt or eating largely processed food (which uses non-iodized salt) may fall short. Deficiency in infancy can cause cognitive impairment.
A trace mineral with antioxidant and immune functions. Daily target: 20–40 mcg depending on age. Sources: Brazil nuts (exceptionally high — a single nut may exceed a child's daily need), seafood, meat, eggs. Deficiency is rare in regions where soil has adequate selenium.
A trace mineral involved in iron metabolism and brain development. Sources: shellfish, nuts, seeds, whole grains, organ meats. Deficiency in healthy children eating varied diets is rare; excess from contaminated water or supplements is the more common concern.
A trace mineral involved in bone development and metabolism. Found in whole grains, nuts, leafy vegetables, tea. Children generally meet needs through normal diets; intake from drinking water containing high manganese can be excessive and is a developing area of pediatric environmental health.
A food eaten close to its natural state: an apple, an egg, brown rice, a piece of fish. Minimally processed if at all. Whole foods generally retain more fiber, vitamins, and minerals than their processed counterparts.
A food altered from its natural state for preservation, palatability, or convenience: canned beans, frozen vegetables, sliced bread. Processing is not inherently harmful — pasteurized milk and fortified cereal are processed and beneficial. The degree and ingredients matter.
Industrially formulated products containing ingredients you would not find in a home kitchen — emulsifiers, hydrogenated oils, artificial colors, modified starches. Examples: sugary cereal, packaged snacks, soda, fast food. Linked to higher childhood obesity and lower diet quality.
Sugar added to food during processing or preparation, distinct from sugar naturally present in fruit or milk. The AHA recommends children get under 25 g (~6 tsp) per day; under age 2 should have none added at all. Most sweetened drinks for kids exceed the daily limit in one serving.
The WHO term for added sugars plus sugars naturally present in honey, syrups, fruit juices, and fruit-juice concentrate. The 100% apple juice in a juice box counts as free sugar. WHO recommends under 10% (ideally under 5%) of daily calories from free sugars.
Children's daily upper limit is far below the adult guideline: ~1500 mg/day (ages 4–8), ~1800 mg (9–13). Most kids get 50–80% over the limit, mostly from packaged food, deli meat, cheese, bread, and pizza. Excess sodium in childhood is linked to higher adult blood pressure.
Found mainly in animal products (butter, cheese, fatty meat) and in coconut/palm oils. After age 2, dietary guidelines recommend keeping saturated fat under 10% of daily calories. Under age 2, fat restriction is harmful — full-fat dairy and fatty foods are essential.
Industrial fat made by hydrogenating vegetable oil; raises LDL cholesterol and lowers HDL. Banned in US food production since 2018 but trace amounts remain in some imported or older packaged foods. There is no safe level for children.
Grains that retain the bran, germ, and endosperm of the original kernel. Examples: oats, brown rice, whole wheat, quinoa, barley. Provide more fiber, B vitamins, and minerals than refined grains. Half of grain servings for children should ideally be whole grains.
Grains processed to remove the bran and germ — white flour, white rice, most packaged snacks. Faster to digest, faster to spike blood sugar, lower in fiber and micronutrients. Not harmful in moderation; concerning as the *primary* carbohydrate source in a child's diet.
Mono- and polyunsaturated fats found in olive oil, avocado, nuts, seeds, fatty fish. Support brain development, fat-soluble vitamin absorption, and satiety. Children, especially under age 2, need adequate fat intake; restricting fat too aggressively in early childhood is harmful.
Protein from non-animal sources — beans, lentils, tofu, tempeh, nuts, seeds, quinoa. Generally lower in saturated fat than animal sources, higher in fiber. Children can meet protein needs largely or entirely from plant sources with attention to variety and supplemental B12 in fully vegan diets.
Foods to which nutrients are added during processing — iron-fortified cereal, vitamin-D-fortified milk, folic-acid-fortified flour. Fortification has substantially reduced specific nutrient deficiencies in children at population scale. Not synonymous with 'ultra-processed' — fortification adds nutrition, processing changes structure.
An immune-system response to a food protein, ranging from mild rash to life-threatening anaphylaxis. Top eight allergens cover ~90% of childhood cases: milk, eggs, peanut, tree nuts, soy, wheat, fish, shellfish. Diagnosis requires a pediatrician or allergist; self-diagnosis via online lists is unreliable.
A non-immune reaction to food, usually involving digestion (gas, bloating, diarrhea). Lactose intolerance is the most common. Distinct from allergy: intolerance is uncomfortable, not life-threatening, and dose-dependent — many tolerate small amounts.
Inability to fully digest lactose, the sugar in milk, due to low lactase enzyme. Symptoms appear 30 minutes to 2 hours after dairy: cramps, gas, diarrhea. More common after age 5 and in East Asian, African, and Native American populations. Lactose-free dairy and fermented dairy (yogurt, hard cheese) are usually tolerated.
An autoimmune condition where eating gluten — found in wheat, barley, rye — damages the small intestine. About 1 in 100 children. Diagnosis requires a blood test and biopsy by a gastroenterologist before removing gluten; otherwise testing becomes inaccurate. Strict lifelong gluten avoidance is the only treatment.
Low red blood cell count from inadequate iron, the most common pediatric nutritional deficiency. Symptoms in children: fatigue, pale skin, irritability, slow weight gain, lower attention. Diagnosed via blood test. Treated with dietary iron plus supplementation under pediatric guidance.
An immune-mediated condition where eosinophils accumulate in the esophagus, often in response to specific food proteins. Symptoms in children: difficulty swallowing, food impaction, vomiting, food refusal, poor growth. Diagnosed by endoscopy with biopsy. Often managed with diet elimination protocols and/or medication; should be evaluated by a pediatric gastroenterologist.
Gastroesophageal reflux is the backward flow of stomach contents; common and mostly benign in infants, peaking around 4 months and improving by 12 months. GERD (the disease) is the small subset where reflux causes poor feeding, growth concerns, or breathing problems. Most 'spitty babies' do not have GERD; persistent feeding refusal or growth issues warrant pediatric assessment.
An immune response to proteins in cow's milk, distinct from lactose intolerance. May be IgE-mediated (rapid, can include anaphylaxis) or non-IgE (delayed, often presenting as eczema, bloody stools, or feeding refusal in infants). Most children outgrow it by school age. Diagnosis and management require pediatric allergy or GI input.
An allergic reaction in the mouth (itching, tingling, mild swelling) to raw fruits, vegetables, or nuts, triggered by cross-reaction with pollen allergens. Usually mild and not progressing to anaphylaxis, but exceptions exist. Cooking often destroys the trigger proteins; raw versions cause symptoms while cooked versions do not.
Two different sugars often confused. Lactose is the sugar in milk, made of glucose and galactose linked together; lactose intolerance reflects inability to digest the link. Galactosemia is a rare inherited disorder where the body cannot metabolize galactose itself, requiring lifelong avoidance of all dairy from infancy — a very different condition than lactose intolerance.
Food Protein-Induced Enterocolitis Syndrome — a non-IgE food reaction causing severe vomiting, dehydration, and lethargy 1–4 hours after eating a trigger food, most commonly milk, soy, rice, or oats in infants. Often misdiagnosed initially as gastroenteritis. Diagnosed clinically by an allergist; most children outgrow the trigger by age 3–5.
A chronic inflammatory bowel disease that can present in children with abdominal pain, diarrhea, weight loss, and growth delay. Diagnosis requires pediatric gastroenterology workup including endoscopy. Nutrition management is part of treatment; some children respond to exclusive enteral nutrition before requiring medication.
A functional GI disorder causing recurrent abdominal pain associated with changes in bowel habit, without structural abnormality. Common in school-age children. Often improves with attention to fiber, hydration, stress, and avoiding specific triggers; severe or persistent symptoms warrant pediatric GI evaluation to exclude other causes.
A short-term elimination diet that removes fermentable carbohydrates (fructans, lactose, fructose, polyols) to identify GI triggers. Used in pediatric IBS under dietitian supervision; not recommended for routine long-term use in children because it can affect gut microbiome and growth. Should be approached as diagnostic, not lifestyle.
A non-IgE food protein reaction in infants causing mucus or blood in the stool, typically without other symptoms; most commonly triggered by cow's milk or soy protein passed through breast milk or via infant formula. Generally benign; resolves with elimination of the trigger and is almost always outgrown by age 1.
The current USDA visual guide for healthy eating, replacing the food pyramid in 2011. Half the plate is fruits and vegetables, a quarter grains, a quarter protein, with dairy on the side. Designed for ages 2 and up.
A practical portioning approach for any meal: half the plate non-starchy vegetables and fruit, a quarter lean protein, a quarter starchy carbs (rice, pasta, potato). No measuring required — works for picky eaters because it allows preferred foods to fill their slot.
The number of distinct food groups consumed across days or weeks. Higher diversity in childhood predicts better long-term diet quality and lower disease risk. Most quality scores ask: did the child eat from at least 5 of 7 food groups in the past day?
Portion sizes scaled to a child's age, not adult sizes scaled down. A 2-year-old needs roughly a quarter of an adult portion; a 6-year-old, a half. Serving adult portions encourages over-eating and overrides hunger cues.
Evidence-backed feeding strategy: a new food is offered at multiple meals (often 10+) without pressure to eat it. Studies show acceptance grows with each exposure, even when a child only smells, touches, or licks the food at first.
The set of nutrient intake recommendations developed by the US National Academies (formerly Institute of Medicine), used by USDA and other agencies to set targets across the lifespan. Includes Recommended Dietary Allowance (RDA), Adequate Intake (AI), and Tolerable Upper Intake Levels (UL) for each nutrient and age group.
Korea's national nutrient intake recommendations, last comprehensively revised in 2020. Adapted to Korean dietary patterns, body sizes, and disease patterns; differs from US DRIs particularly in sodium, calcium, and iron targets. Used by Korean pediatricians and public-health programs.
The current WHO recommendations for introducing solids and other foods alongside breast milk between ages 6 and 23 months. Emphasizes nutrient density (especially iron and zinc), responsive feeding, appropriate texture progression, and avoiding sugary drinks and ultra-processed foods.
The American Academy of Pediatrics' comprehensive guidelines for child health supervision, including specific nutrition guidance at each well-child visit from infancy through young adulthood. The de facto standard for what pediatricians ask about and screen for nutrition-wise at each age.
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Miriel